Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5fe0715d24fd72…

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 04:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4a081fd7476445acc868d86fda64fad SHA-1: 3b627d59eccf4d4fad7e1aa04a8d22030954ba61 SHA-256: 6d5fe0715d24fd729c7d883cd7baf9f23592e812933bc3ccf8f95b94f87550f8
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 benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. 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.me/wix?keyword=foundations+of+modern+analysis+fried
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/latest_hollywood_movies_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/animals_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/pinox.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/adobe_pdf_reader_for_windows_7_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6590/files/bajaj_allianz_health_insurance_cashless_hospital_list_in_delhi.pdf
    • https://static.usrfiles.com/ugd/b8c837_24fbb136c5d040d2920d5b49b8cfa2b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c66bee8f36240ab9f0693405fe6d8ca.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8487/files/albite_reader_free_for_nokia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/30707953428.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/giporogiditutubevek.pdf
    • https://cdn.shopify.com/s/files/1/0440/9730/6776/files/91629470096.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/sosonukafaroteb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/legal_stages_smash_ultimate.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/list_of_foods_to_avoid_with_diverticulitis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/67239022055.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.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_off00005828.bin
7e27887a882229f142b3649a5e0cd0e1f6ae7c2bb52a6a950a44e226d031a4b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5828 5112 bytes
font_01_sfnt_off0000697b.bin
504aaa392501e4db79eabef082927376431dbe4b9fa1e0a1b0cd465543278fdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 9808 bytes

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