Malicious PDF — malware analysis report

Static analysis result for SHA-256 857c5a04fcc8869c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 11:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80f10b3c7a0c0494bdfa3926c8c0373 SHA-1: a6ecfc3d8b35c05ac88f06b8d3bac425d4403dfb SHA-256: 857c5a04fcc8869c9d9bcb386ff3ada7d0b2947525bd1a0528a779c548c8d224
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=voyages+in+english+grade+6'. This suggests an attempt to direct users to malicious content under the guise of educational resources. 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=voyages+in+english+grade+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/buwiwudodanet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/solidworks_scan_to_3d_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/pezopasulatimesev.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/harvard_business_case_studies.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/rhizobium_culture.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/11561499576.pdf
    • https://cdn.shopify.com/s/files/1/0440/4976/0406/files/gu_medical_abbreviation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/verbier_piste_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/5384/1560/files/crak_photo_shop.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/math_algebra_rules_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/curriculum_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/unlocking_android_a_developer_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/fugodikodawitubukexeni.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_off000075d9.bin
d8954cfd0deae56649e8134ec33acf7ed2b28861a3a1821a4dd81f0ab79f45b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 5308 bytes
font_01_sfnt_off000087d2.bin
6efc4f173748b904f3ad04822c333ee8afab7164c6d1a6cb646ea7031bd81acb
pdf-font-stream PDF embedded font (sfnt) at offset 0x87D2 11752 bytes