Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2af6d12e3d27b…

MALICIOUS

PDF

52.6 KB Created: 2020-07-22 07:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: cbe3a2d44f79adf51adeec44ee332585 SHA-1: d390fcd6eb57499a5ac86860e11972da688a7862 SHA-256: 18d2af6d12e3d27b323ea14d7a8a5c338ec41343b86d64bd8e79d90e5ddc7ae3
194 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many of which point to a redirector service (ttraff.ru) and appear to be part of an SEO link farm. This suggests the primary purpose is to drive traffic to malicious or spam-related content, potentially for phishing or ad fraud. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this. No scripts were extracted from this sample.

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://ttraff.ru/wb?keyword=reading%20skills%20for%20advanced%20students%20pdf In PDF document text
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdfIn PDF document text
    • http://files.miyps.com/uploads/1/3/0/7/130740196/lapenipi-wanotani.pdfIn PDF document text
    • http://files.bhberg.co.za/uploads/1/3/1/8/131856166/lumozovunapojur_jagokelapele.pdfIn PDF document text
    • http://files.pureandsimplewellness.org/uploads/1/3/1/4/131437953/e718a3f3b241b.pdfIn 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/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vowalege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7478/1338/files/lofugukagawafiwesi.pdfIn PDF document text
    • https://nirakopifaz.files.wordpress.com/2020/07/4430966750.pdfIn PDF document text
    • https://rawatereg.files.wordpress.com/2020/06/24480370207.pdfIn PDF document text
    • https://mabozewunes.files.wordpress.com/2020/07/61122455506.pdfIn PDF document text
    • https://girewidafe.files.wordpress.com/2020/07/zuwuzodujanubef.pdfIn PDF document text
    • https://konoxadejuk.files.wordpress.com/2020/07/demufijunuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9776/5528/files/lebuwoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/58089180189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/dudibogusakenaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/71594021181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/72001930708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/96773304738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/42959010183.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_off00008e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E52 5336 bytes
SHA-256: 3bbb794205528f4578b6fe3bef0166fa7024a402ba261b5bfc32af9f33de8a7f
font_01_sfnt_off0000a094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA094 10436 bytes
SHA-256: 209b3a50f067c0cea52d554e8d552921774452563acc54ccdb9b1252f213e49b