Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0a5f4c1bb502bd…

MALICIOUS

PDF

39.3 KB Created: 2020-08-22 07:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f106a78e6a19aae56a067802981509ed SHA-1: 6c9f351bc997e797e04d2d2e89e99028783468f4 SHA-256: da0a5f4c1bb502bd8ad33f45f55588bb5620e3a29e502c3c4b8a68839e59053c
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Android 9 pie samsung a50' and includes the malicious URL, suggesting a lure for a phishing or scam campaign. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=android+9+pie+samsung+a50
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/67267371116.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/lemurukisumane.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/4209725413.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/85881664479.pdf
    • https://cdn.shopify.com/s/files/1/0451/2101/1865/files/vehicle_wrap_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/32908975732.pdf
    • https://cdn.shopify.com/s/files/1/0458/2752/2723/files/misovevujukuzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77439678162.pdf
    • https://cdn.shopify.com/s/files/1/0435/6407/3128/files/pemex_business_plan_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/9126/1595/files/employee_appraisal_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/schistosomiasis_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/jemiwanetuwozej.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_off000059fa.bin
d19da323e779ffa1689b628a63b695311cd683e4fdc933bd9a7f6f7b4809980f
pdf-font-stream PDF embedded font (sfnt) at offset 0x59FA 5660 bytes
font_01_sfnt_off00006d1d.bin
c2c14181361e9083cb6f2eb007a303f07ab773dd91ef955df95b77b1e2ca0a8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 10704 bytes