Malicious PDF — malware analysis report

Static analysis result for SHA-256 725de983de35b66f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-22 23:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b01331004437576b1f890b1e8f2e1885 SHA-1: 15ddaa0a815772c122372ea520c5043e18fb4bf1 SHA-256: 725de983de35b66f571242a136b5d5c9b1cdcfd7b5905c5bb8f618c2d98d8447
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a direct link to a known malicious redirector, disguised as a technical document. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest an attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the presence of numerous links points towards a phishing or redirection scheme.

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=cisco+ons+15454+dwdm+troubleshooting+guide
    • http://files.eplabelexchange.com/uploads/1/3/0/9/130969505/gurinobalojuwilo.pdf
    • http://files.vineamentors.com/uploads/1/3/2/3/132303219/4057360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/fuxibilujivekeleledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/24211633732.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7607/files/bachelorette_party_invitations_free_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0438/2529/9613/files/18413840999.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/borderlands_2_skill_tree_zero_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7811/4727/files/show_password_asterisk_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/59250322074.pdf
    • https://cdn.shopify.com/s/files/1/0452/4307/2674/files/android_9._0_samsung_s6_edge_plus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/vepiwixekulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/arduino_mega_2560_r3_pinout.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3557/files/building_materials_company_profile.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_off0000693d.bin
deb26a501a3668d65390a382a0191f36299c49bd8f84d2976f96a716dc9524a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x693D 5544 bytes
font_01_sfnt_off00007c06.bin
60959380af15ce54b62cb511815cf34f3cf329e5078ec818cbcb2d4c8ae3b66f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C06 11992 bytes