Malicious PDF — malware analysis report

Static analysis result for SHA-256 172396aacd7dc477…

MALICIOUS

PDF

55.9 KB Created: 2020-10-30 15:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ce5965b8d7b92bb3ed05e54f928fb7cf SHA-1: 26a44f4caf7eae2db2968cc22846e63e411f847b SHA-256: 172396aacd7dc4771c464b4147060a74b30a0f03a16429e6f49dfb4b04d37319
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a redirector URL, identified by heuristics as malicious and part of an SEO link farm for phishing. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary goal is to redirect the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=truth+campaign+2016 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6616/2841/files/piniguvowefejewibaguno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2176/0174/files/java.lang.illegalargumentexception_file_contains_a_path_separator_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/bujefituwetitupufuwetam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0310/0313/files/79263660179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8827d8d3-563e-4d07-af9b-d2328dc970cf/26387459241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8038/3171/files/62073032808.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/xovabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2738/4488/files/merge_files_online_into_one.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7481/6674/files/40x_escape_level_35_answer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4967/5671/files/18387251418.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/stars_classroom_comment_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8244/1410/files/piano_sonata_11_mozart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0147/6758/files/swordigo_guide_corrupted_grove.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_off0000978e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978E 5564 bytes
SHA-256: e41ea59f5bf997bed2d316704ef875be1f9eec3446a67e8c2b759549def5a17a
font_01_sfnt_off0000aa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5B 12128 bytes
SHA-256: 63a8f07c5e2a812337ab0dc4dcb1ad4cca17c285774aa9c6ea1c25ee17f0a7c2