Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a5f6777b3ecf5a…

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 13:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c57e0784a4561b4d059050d83e78322 SHA-1: a4fde0a5fad088b707007e74d1633d7eb64d2c23 SHA-256: 78a5f6777b3ecf5a608876e60c86406b7e15f7bc843eeba39f2ea8d173864348
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to direct users to a malicious redirector URL. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a SEO-based lure to drive traffic to potentially malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/pify?keyword=adaptability+definition+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_9a3b37f170d244a4b7b7ee49d1f1d659.pdf
    • https://static.usrfiles.com/ugd/b8c837_05fc6b405cbd426b9c1872f1efcbf1fc.pdf
    • https://static.usrfiles.com/ugd/64f9d2_bbfa8293e938444e8c0f66f900945b4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f98010e7f1a449c86d15ffb029b3a66.pdf
    • https://static.usrfiles.com/ugd/a771bd_7204d54b4e30498bbf202d901e3136d2.pdf
    • https://static.usrfiles.com/ugd/a64c8c_6e49c68da112418898058d7c2274a522.pdf
    • https://static.usrfiles.com/ugd/b8c837_a11e4930f492412a8ba1e6bc3da0b29d.pdf
    • https://cdn.shopify.com/s/files/1/0464/1226/7688/files/rugerok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/ps4_gta_5_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/90606003224.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/pofururaxobipenabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1244/7652/files/metodos_anticonceptivos_definitivos.pdf
    • https://static.usrfiles.com/ugd/80c1db_41f6cdcf52da41cd9c4c371ed35464ab.pdf
    • https://static.usrfiles.com/ugd/10a4aa_ba7d8d5b49f54c2288350b8ccf7d70a9.pdf
    • https://static.usrfiles.com/ugd/5ecadc_56aa68cc60ae49ee8ddddb592c78af28.pdf
    • https://static.usrfiles.com/ugd/de60da_34d21d6494f54ab6bfe47c0d48182df1.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_off000072c6.bin
5ffcfe58f607759327feb11ba48cf3d27cdf9abe37623f651c9881b63267d3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 4992 bytes
font_01_sfnt_off000083e2.bin
3023a2414453cd483ae39f062ba895172521a242d17e956ea858029c8295631c
pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 10228 bytes