Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e278ca1b16b9e1d…

MALICIOUS

PDF

44.4 KB Created: 2020-09-02 07:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60df7dbba8131da86f6c33432fb3544b SHA-1: f3b036f8c102c1e12a2ee79fdf8b3b203532b4d5 SHA-256: 0e278ca1b16b9e1da58d7b00b33d63af202637fca0242d6760013f405509742d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting educational content, likely a lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to a phishing or malware distribution site.

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.link/wix?keyword=free+printable+math+algebra+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/best_ball_format_golf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/risemozorovuzorijan.pdf
    • https://cdn.shopify.com/s/files/1/0440/0028/0726/files/mujafug.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/78856983686.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/vocabulary_accounting_and_finance.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/81526031043.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6057/files/branding_strategies_journal.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_558fd778c7bc49ae9c7afc1091e46e48.pdf
    • https://static.usrfiles.com/ugd/39cb9d_715b7e840eab475aaeb50e8de2c17e1c.pdf
    • https://static.usrfiles.com/ugd/b5973a_3531255c2d5a4e38badc9bfcaf422958.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_6e2852edebfe4d248fbceb84a1d109be.pdf
    • https://static.usrfiles.com/ugd/90423f_544eec7df4544866a6c832399ac24e5c.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_off0000696f.bin
49db95223a978f6a1b975fb508c0ffc35b447c1e57fc2c466049335d5b66feb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x696F 5484 bytes
font_01_sfnt_off00007bfd.bin
aed4ae5ef14c473e65f8eda62faedb8acdcc76409b756f4f090563dd05c250ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 12096 bytes