Malicious PDF — malware analysis report

Static analysis result for SHA-256 86714f014a6e714e…

MALICIOUS

PDF

48.0 KB Created: 2020-08-09 01:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28e4a6f8eca9774359b53c186cf6c86f SHA-1: c2c2d08967b2aab00ace534fa14173559b9fe646 SHA-256: 86714f014a6e714e26cf50309d795ba9fc1985dec485a1e7824f8ddb06dcd5ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to a malicious redirector, and another critical heuristic identified it as a link farm containing numerous external PDF links. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.cc/pify?keyword=absorcion+atomica+pdf, which is the primary malicious redirector identified.

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/pify?keyword=absorcion+atomica+pdf
    • http://files.kosmocompany.com/uploads/1/3/2/6/132681672/2c4b515069.pdf
    • http://files.dnaleatherwa.com/uploads/1/3/0/7/130738814/8327209.pdf
    • http://files.cassandraliuzzo.com/uploads/1/3/1/8/131856125/ralonaxigawiro.pdf
    • http://nimoj.studentartsmagazine.com/uploads/1/3/2/6/132681352/7bc4c82710.pdf
    • http://files.rhpcollegecounseling.com/uploads/1/3/2/6/132682989/joxajijeraro_vikiduninugumiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/mukapikobopitofonisik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/15985439755.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/31719404161.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/xovelovogekezirowodugawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/45164620787.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9675/files/waxovelalotalut.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/5467112230.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/68732226812.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/pigibemibadelej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/atlas_de_microbiologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/tasuxapopapuve.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0391/files/jeluv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/c_shell_script_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/40921789300.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007eac.bin
62a6cda1ed7959d865e7f4e5d4b5f43932262f9d0bd9524785c28146c97ad23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAC 5396 bytes
font_01_sfnt_off000090e9.bin
922ffe0fdd0a0feab6bba0cfd7125964f250529d26931ba5187c073b3f93ce6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E9 9964 bytes

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