Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38fcc265fcc9476…

MALICIOUS

PDF

48.2 KB Created: 2020-08-16 00:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe54755f86942c53de4362aa0c92cdc SHA-1: 825d096b18b4fdd3312835b7e23ae857a018d8f8 SHA-256: d38fcc265fcc947611c18a8e2e44bed71fe2c62168280eb9e4ebfb6cb3a0e7f3
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO poisoning or redirection. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is likely the primary malicious payload delivery mechanism. The document body contains the same suspicious URL, reinforcing the intent to lure the user into clicking it. 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.ru/pify?keyword=new+android+auto+apk
    • http://zabanoli.impressionablemindslearningacademy.com/uploads/1/3/0/7/130775195/3006308.pdf
    • http://bonem.kpquiltingstudio.com/uploads/1/3/0/7/130739615/9934801db9d3dd4.pdf
    • http://xeten.estelleasselin.com/uploads/1/3/1/4/131483281/xakakebugiwolup_xeledijetus_sedotux_jajopibe.pdf
    • http://jidel.hvaband.org/uploads/1/3/1/4/131483027/17e6628ecef9.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/jezakesunatimafefob.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/roblox_gun_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/hurst_zip_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/employment_certificate_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/j_s_motorcycle_lifts.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9564/files/how_do_i_electronically_sign_a_on_my_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/jupemekuzajijofomesode.pdf
    • https://cdn.shopify.com/s/files/1/0452/0719/1701/files/29012248645.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7736/files/business_plan_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/medical_fitness_certificate_for_leave.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/steps_in_personal_selling_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/64600657808.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/62159449091.pdf
    • https://cdn.shopify.com/s/files/1/0429/5622/6716/files/diwegirexajoxukurewu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a52.bin
b4da0ab27f8b8900473c6cbad4c1b87f8a84e37be2fb4327a03054cb6f47fa35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A52 4868 bytes
font_01_sfnt_off00007b01.bin
a0b9f640c7b360e6037470a6f658c3604aa5a0de9768b78a51f5a92fb18d44f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B01 10192 bytes
font_02_sfnt_off00009e18.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E18 16204 bytes

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