Malicious PDF — malware analysis report

Static analysis result for SHA-256 7753ca66599a6c44…

MALICIOUS

PDF

58.2 KB Created: 2020-08-31 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8708f1de263ed3178ad6d581599de3da SHA-1: e59e6a5ef78c5ab4c5de85dac7c6acfb13dfe49b SHA-256: 7753ca66599a6c44d7db066a54dced8fe1649da92db5437d1d093a2280d14779
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=ectopic+pregnancy+acog+guidelines', is flagged as malicious redirector infrastructure. The document also features a large number of external PDF links, many pointing to Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or redirection 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.ru/wix?keyword=ectopic+pregnancy+acog+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/27206181381.pdf
    • https://cdn.shopify.com/s/files/1/0431/7986/8309/files/clair_de_lune_sheet_music_for_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/background_opacity_css.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/71995507665.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/21466590214.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ad1b897190417794d4720556388221.pdf
    • https://static.usrfiles.com/ugd/c3548c_dde6410fd0ad4a96b9eeb1c2a82f2195.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_9320673d6cbe44f3a0db2ded452582ef.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_e515e8b7b3e64dddb59729ac0db15637.pdf
    • https://static.usrfiles.com/ugd/3dd68e_07e6cf86998941c4b10dfdae1d4fc497.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/jerusalem_bible_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/numafaniri.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_off0000a13e.bin
a99d43b3ad1b947c608881100072ad497a06fcea208fea2e33af4303b1de1f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA13E 5300 bytes
font_01_sfnt_off0000b360.bin
dae585f90d7da01472d152d9506eb3bb66564a4cd9e47725ed2f44e6146179f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 12588 bytes