Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfb2b4b5454e709…

MALICIOUS

PDF

44.8 KB Created: 2020-09-03 12:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06a70b5e8403346d5d36762039de45a SHA-1: 226854c02487216f300f0dde64157864be60ef1a SHA-256: 1dfb2b4b5454e7091535643b15c8d4931fc5d6810e188546b6cf6710a2f84e4f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.club, disguised as 'Dialysis guidelines 2019'. This suggests a phishing or scam attempt to redirect users to malicious content. The document also hosts a large number of external PDF links, many pointing to Shopify, which is characteristic of SEO poisoning or link farm tactics to improve search engine ranking for malicious sites.

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.club/wix?keyword=dialysis+guidelines+2019
    • https://static.usrfiles.com/ugd/0adedf_f17cddace2e54142a39322f17a4350e7.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_b99159404da848488cc9e7a222b9278a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/cover_letter_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/16641824758.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/75232414527.pdf
    • https://static.usrfiles.com/ugd/87a178_d15bd80cb62f45c0b0d3be12734ff128.pdf
    • https://static.usrfiles.com/ugd/a72fa8_467e5faf457b4762aef1ac0b45bd2f71.pdf
    • https://static.usrfiles.com/ugd/097bd5_17583f4e2f544ec5b6bf3436adcdc51e.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/wesevazisupake.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/jatizufotukev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/abdominal_ultrasound_anatomy.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070da.bin
10e3359cc9cb59d27b74f61657e8e3632a1bde387931e6307918670765f0d6e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 5480 bytes
font_01_sfnt_off000083a3.bin
39adc6dbdceffcb1894b0e1f49b5fa885bab7a07493d810f4a020294871a4f64
pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 10096 bytes