Malicious PDF — malware analysis report

Static analysis result for SHA-256 19556fa7b97597aa…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 05:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b5c7d363c193d6fc8cffa05ad87cdc SHA-1: 645b1cb3cb8b9a36209d082025f801b108ae17dc SHA-256: 19556fa7b97597aa1953426197e3a3bf9bfb4d9813e7a873d844992cf2de7158
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=american+english+picture+video', which is also flagged as a malicious redirector. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt, likely to lure unsuspecting users to malicious content.

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.com/pify?keyword=american+english+picture+video
    • http://furiperig.zoppideafcamp.org/uploads/1/3/0/7/130776680/53e818428a.pdf
    • http://files.clemmonspresbyterian.org/uploads/1/3/1/6/131637043/7b0c5f.pdf
    • http://files.saintpadrepio.ca/uploads/1/3/1/4/131454505/3812091.pdf
    • http://tafavabi.abbi.ca/uploads/1/3/2/3/132303035/3509094.pdf
    • http://files.vivafitsb.com/uploads/1/3/1/3/131383860/zuxireli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/21230621215.pdf
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/art_and_artist_rank.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/email_address_that_starts_with_m.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/phd_thesis_evaluation_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/folijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/40683743939.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/rubuvofejudalavevigoxopuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/acute_glomerulonephritis_post_streptococcal_infection.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3718/files/49241935962.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_off00006902.bin
4ccba21c8a024f55c2abafdd28db9f7e89e3372f82baf89561e7f480f02809f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6902 5536 bytes
font_01_sfnt_off00007ba0.bin
92ba7bb9016bc546eb356a45d36af95c9b6966c0074ab9cb7d4ae28dbf4ce701
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA0 10016 bytes