Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c056f3f6d87b93…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 01:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e2bbb628a9e4e194c964108420d3bb SHA-1: a9715f49ce7a597cf5eb8c2382cc7cb48a25a0f1 SHA-256: 72c056f3f6d87b932c00ba00a41a2236bba3c268a4124dbb27bb4649d268d268
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a worksheet. This indicates a phishing or malware distribution attempt. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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.cc/wix?keyword=rationalizing+radical+expressions+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/daxuxejedazuwewopakivamak.pdf
    • https://cdn.shopify.com/s/files/1/0439/1642/7419/files/bolixezusebirulazuwig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/damuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/avatar_comics_imbalance.pdf
    • https://cdn.shopify.com/s/files/1/0436/6827/5353/files/29952994699.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/ruzamebetozinol.pdf
    • https://static.usrfiles.com/ugd/fb83f1_71c9b285437549ada3784206e44141d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a069e590c199413ba56d35450666b219.pdf
    • https://static.usrfiles.com/ugd/b50c55_13eebfe397cc46629710542af0c45b9e.pdf
    • https://static.usrfiles.com/ugd/96768c_3dc824ba21ca48d990375e043923b099.pdf
    • https://static.usrfiles.com/ugd/b8c837_96fc0f23e4144a17826ac6aca3cbee9b.pdf
    • https://static.usrfiles.com/ugd/daca0d_602adb64d1bd40a2a5d8f34d2de2eb62.pdf
    • https://static.usrfiles.com/ugd/8b97dd_2f55c79a85c14677987523d551b3fe17.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_c85a6d589e1c44fdb40bf79424c0556a.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_off0000610b.bin
71fe92b51243a731c1e12de1dc0ebe5a6cb90701530627923bfe1fdbe892ce81
pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 5616 bytes
font_01_sfnt_off00007449.bin
4cd001b4c2c3d1e04af7dd57b9a4688dcf9cb0d6ab63b2fd50546ba7a5886ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 9932 bytes