Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b95835eaab84ee…

MALICIOUS

PDF

42.0 KB Created: 2020-08-24 10:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51860bdfb435cb77014407d66ca732b7 SHA-1: 93c1244bb4bcef1d56bc7d302784f330c20a8b5e SHA-256: 71b95835eaab84ee88e268fb89bb41632a0b5cc1beb32612ed8025eb4d2a21f9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to redirector infrastructure like 'ttraff.cc', which is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users interested in a specific song. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

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=ninja+hattori+tamil+song+video
    • http://files.europeanburmesebc.org/uploads/1/3/2/7/132740804/suxeribeduris_mubagaw_niwapaloze.pdf
    • http://files.ryancoletd.com/uploads/1/3/1/3/131379552/japimefuz-kawimitonevexiv.pdf
    • http://zobug.shinyheadmusic.com/uploads/1/3/2/7/132712413/xigokuwi-rozudu.pdf
    • http://files.castleonthemount.com/uploads/1/3/1/3/131381374/4844325.pdf
    • http://files.singletree-emporium.com/uploads/1/3/1/4/131438891/9046474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/7452749596.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/zivogexenuxaxakir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/past_perfect_tense_vs_past_simple_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/career_path_finance.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/the_economist_may_5th_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/94021544682.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/73887916742.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/56976954542.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/limatabumisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/antichrist_movie_in_tamil_dub.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_off00005f97.bin
fd3d88b16e870a63e9431dda6080c948a069bdd98aeb2214fec9be657567c0ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 5344 bytes
font_01_sfnt_off000071a0.bin
2776d0b6439536f25d25a86309f1092d7aa3b7d2b28fc947bb6a6bf1fd60e5ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 12964 bytes