Malicious PDF — malware analysis report

Static analysis result for SHA-256 8680a9d21588327b…

MALICIOUS

PDF

45.8 KB Created: 2020-08-29 02:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88eb21a0d50882e00a723e3989a01d0e SHA-1: e39e895bc345d3caecfb16a1303c5a4c33f763ea SHA-256: 8680a9d21588327bc8934b4ec394efa0f0a1ebdd1b02956e8b90b2fdc248bf8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service identified as malicious. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. 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.cc/wix?keyword=limit+0+0+belirsizli%25C4%259Fi+k%25C3%25B6kl%25C3%25BC+say%25C4%25B1lar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_eeb644a8260646139682e89063430a1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9560792eea749edb5500466834619e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_86bb724a6c4c4758951bdfc7cabb3def.pdf
    • https://static.usrfiles.com/ugd/b8c837_89144cee0e56416bb73b154dfc3b7f77.pdf
    • https://cdn.shopify.com/s/files/1/0436/7322/3321/files/que_es_el_control_de_calidad_total.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/98718809396.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/shroud_of_turin_photo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/80996420534.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/zimof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9481/9484/files/70469510434.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/toxuratevemog.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005260.bin
bde6bc72dc6777e168aded4048c4e3972e517722b2a3f75fc6fa7760eab64f9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5260 5792 bytes
font_01_sfnt_off0000659e.bin
8a755fb831db7b974aa956e807b341e6249355dabe22079aaf8c337829a84a08
pdf-font-stream PDF embedded font (sfnt) at offset 0x659E 14920 bytes
font_02_sfnt_off000092e9.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x92E9 16144 bytes