Malicious PDF — malware analysis report

Static analysis result for SHA-256 81862d26a8e02514…

MALICIOUS

PDF

50.2 KB Created: 2020-09-04 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 834af254506262cbd218905c26673d88 SHA-1: 7f004fbbd3fd96d50ccd0f9e9a4a9e2737e248f1 SHA-256: 81862d26a8e02514a3b12edc6d2f2f3b5ece287fc44252448b3b8d998bd6eba0
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'Avg vpn for mac' and the malicious URL, suggesting a phishing lure. The presence of numerous external PDF links also indicates a link farm, a common tactic for SEO manipulation and traffic redirection.

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=avg+vpn+for+mac In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/89441e_cad3a79e7f4249978bda6a825dd5b255.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_34adb5eaa6b245c2b452b7330120860a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/61b8bf_8318b69599034941b77228cffe74c007.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c722c2_09b469971ed5428492a52e01b411a5ea.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f515ca_c6b210e1645a4b49812fa6eeb443dea9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/007d40_0f56bae4dd9d4bb595d9068806ebd414.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1813b3_f6f858ead10d4fc59c75853e7b1303c9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2e4eb4_af1ecabe651b4574b6e1956922ec01c0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/455f95_b9a5b0d76c524533bfbc1a7d9a443a13.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c81504_5c11bd7b3ec54dc0a691d8d5481179f2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ecadc_df84157f38434f038e053e662ce583cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a91264_5770de2db8654f458bf3de936ead5d50.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0a593f_dd854d09637249439afb10659651593d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 4716 bytes
SHA-256: f7254de89e2a28952989fd91ddb7ac0da0642b986a598d806a71b908fc64003e
font_01_sfnt_off00008ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 10344 bytes
SHA-256: c3e198d25d77635af83f6770322583013ad49ea8c49a1070b5f8f0408d11acad
font_02_sfnt_off0000ae39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE39 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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