Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d4578c56772b1d…

MALICIOUS

PDF

43.3 KB Created: 2020-09-01 03:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d66aa92d188139d00b0057413673e1 SHA-1: 78b495b2c72486d8fa6d1272b8dc46a4623ac1ac SHA-256: 13d4578c56772b1dc5a83ebc264ab419226b5da2d89a759c741f41267265b6f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a malicious redirector. The primary malicious URL identified is https://ttraff.ru/wix?keyword=safety+signs+pdf+free. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/wix?keyword=safety+signs+pdf+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/online_nkjv_bible.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/kefesup.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/wesin.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/ferivepakanexajidijesokew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/rinuk.pdf
    • https://static.usrfiles.com/ugd/12f4eb_91336d25ea334725959d1278e667c7ee.pdf
    • https://static.usrfiles.com/ugd/3ce946_790419b932934504b665ece3849d970d.pdf
    • https://static.usrfiles.com/ugd/b88e3d_644582a569a54387a618ff30dbbd73d1.pdf
    • https://static.usrfiles.com/ugd/432b07_c7cd4f734c1e462fa83437e9b2172ccf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/xemewadevika.pdf
    • https://cdn.shopify.com/s/files/1/0438/8762/4344/files/nezapal.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7557/files/football_world_cup_2020_groups.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/putebuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/netflix_android_app_subtitles_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/fudinev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a71.bin
c64f8b445af218d22535d4ac278a2054e8d120aff34415bb7496df58efd43ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A71 5384 bytes
font_01_sfnt_off00007cd9.bin
04402ede737c49bbb8c7a7e628990ab43796e462e547d24b6e414d73bcf0c2a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD9 10740 bytes