Malicious PDF — malware analysis report

Static analysis result for SHA-256 05580b5c6b4e08e3…

MALICIOUS

PDF

37.7 KB Created: 2020-09-08 09:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b2e176df683fe0922518983fdb20de SHA-1: 6eb035bd12ef5726829052fca52fa51a4b913562 SHA-256: 05580b5c6b4e08e36049e0dab51a1f07f9635f8d28e93fefa090e24d8184577d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'algebra 2 trig common core textbook pdf' and a URL, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of a redirector link points to a phishing or scam attempt.

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.me/pify?keyword=algebra+2+trig+common+core+textbook+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e0dc_2cb0674dac7545389aee0e48cd74a42b.pdf
    • https://static.usrfiles.com/ugd/40336e_f9c997b990b045c89648b34a18968c51.pdf
    • https://static.usrfiles.com/ugd/8716ab_8e38c37be1d64b1cba2ee2310ee70de3.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_10abd7bb93174a47b616ae858872c9eb.pdf
    • https://static.usrfiles.com/ugd/a51aec_d509361a014b445dae62ee81527c4f6d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9580/2527/files/wix_website_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8424/files/answer_synonym_noun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/93917999526.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/vomojerizodomusuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/aseptic_filling_process.pdf
    • https://static.usrfiles.com/ugd/5b9365_ebf60b8aa2b64abdbd15dc36a8c804dd.pdf
    • https://static.usrfiles.com/ugd/6da380_5eb9a7417e624b5096d62a6c38385be6.pdf
    • https://static.usrfiles.com/ugd/2074c9_7a220ecebafa47a18ef4a758f2d4fbf6.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/tivubodepixajev.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/94657686468.pdf
    • https://cdn.shopify.com/s/files/1/0439/8268/4318/files/22791134950.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_off000050b5.bin
bf8595631b3c0e134543551d842dc161f54e4a21c9c7293bb7f26883b1d84da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x50B5 5688 bytes
font_01_sfnt_off00006403.bin
56cd3f830499df69ea13c227d2bd612db96ebcfdc2b6bfca0169a02ee60a4a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6403 10632 bytes