Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8b4a5ac86851d3…

MALICIOUS

PDF

45.0 KB Created: 2020-10-29 01:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 170202929cb366d388a63688d1ea49cf SHA-1: 2afed5c2ff030d7b185e8350ab8ff20cbde47c32 SHA-256: ab8b4a5ac86851d3a80a4a96339873fde99805a7c605f7d4e9958697677726d9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/123?keyword=asturias+guitar+tab', which is also flagged by heuristics as a malicious redirector. The presence of many external PDF links indicates a link farm designed to manipulate search engine results for SEO purposes, likely to funnel traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=asturias+guitar+tab In PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/76b3e2746.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/1911800.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/1181add08fecfe.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/3711696.pdfIn PDF document text
    • https://xozoravupot.weebly.com/uploads/1/3/4/3/134314106/7da53ba.pdfIn PDF document text
    • https://xubikorapaja.weebly.com/uploads/1/3/4/3/134335605/3944733ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farezelof/11388360048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0613/8787/files/total_war_attila_religion_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/2072738557.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/mariadb_tutorial_point.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2654/7366/files/linebit_icon_pack_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4188/2780/files/82450379236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0339276f-39b3-46ca-88a9-ce999d270e10/88548957941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715ef32a-7a93-41e2-bafc-1c30408710ae/40715731726.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/88437859216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de864bb2-73db-421c-a66c-5dc74dd7173f/15591999016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2698b0-1cb9-4a59-9164-ecac445c0482/wujofaroxisigixaxolufopo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/48523499585.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/45375322082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2874/8739/files/canadian_guidelines_for_hypertension_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/how_to_make_the_color_gold_with_food_coloring.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/vusozotudenagurogupibis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa5b88e-837d-40d5-bf28-4051e4879a0d/4575283218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 4948 bytes
SHA-256: 23d50532ef01d3c1d58e99e65a9ccbb1e85b86176506a1568e058212801fa6d2
font_01_sfnt_off0000812c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 11804 bytes
SHA-256: ef678ee99e41e3f705ba9d5d35aff8b59e60b2803a56195e345de3e2b22e14a4