Malicious PDF — malware analysis report

Static analysis result for SHA-256 1126fa153a4fa10a…

MALICIOUS

PDF

43.1 KB Created: 2020-09-11 10:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960898f28da806056be1f2b01351b62b SHA-1: fc08b46d1821fd97fb7db1af173deb71af289f1e SHA-256: 1126fa153a4fa10a64c49729eb0e7dad8ba6a565f73e15435109b2855e5c59be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the same malicious URL and a large number of other URLs, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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=nutritional+information+in+brown+rice+flour
    • http://files.microneedleregulatory.org/uploads/1/3/0/9/130969209/giwuvizalapunemaf.pdf
    • http://files.apneaodyssey.com/uploads/1/3/2/8/132814050/xozomobewigo.pdf
    • http://files.mtviewcrc.org/uploads/1/3/1/8/131871515/dofebekuwosuxoka.pdf
    • http://files.bestgardendesign.co.uk/uploads/1/3/0/9/130969607/4312623.pdf
    • http://nofibivok.okrarestaurantgroup.com/uploads/1/3/0/8/130874067/8200659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8bbd7_89c5026af70e47dc86003449089e25cd.pdf
    • https://static.usrfiles.com/ugd/0994f9_b8907654eb6842068061e9de88e096d8.pdf
    • https://static.usrfiles.com/ugd/c3548c_eaceb8d9d5a54b18afc4a3643a36b74c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5431/8239/files/93443603146.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7846/files/jio_caller_tune_number_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/install_android_app_on_mac_os_x.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/gidurowirifebetali.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/human_diseases_a_systemic_approach_8.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/xaxisodezuvuziru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0853/2380/files/46263732041.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_off00006b45.bin
b0b5ab470bdb1adac5ecfd79a201243f19925510b5c3abdc36d959e9754e1fcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B45 5052 bytes
font_01_sfnt_off00007c79.bin
aeb74744f777ed6e26c1c8684e5f114de5a0b278458f479e34e266d46ca099ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C79 10232 bytes