Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f7885023d28bf5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 07:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93c2ec19caee623d868c2398f3b25c48 SHA-1: 645b9767246725cde6fac8e72813d230cca5b138 SHA-256: 13f7885023d28bf5ce2120485e327343c88adb443f08767ada87d6586304a740
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains embedded links, one of which points to a known malicious redirector. The document's content and heuristics strongly suggest an advance-fee scam, likely aiming to trick the user into believing they are filling out a legitimate claim form to initiate a fraudulent transaction. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm and redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=aflac+sickness+claim+form+pdf
    • http://files.drivertraininggoforit.com/uploads/1/3/0/7/130739686/17e1fb690a7338.pdf
    • http://baralo.reisitellimused.com/uploads/1/3/0/7/130776031/rulova.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/caesar_cipher_in_cryptography.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/webepuvedinovaxijixen.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/6094072232.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/89942601115.pdf
    • https://cdn.shopify.com/s/files/1/0433/5324/3816/files/90944220515.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/winesisizowuxeladaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/82586440607.pdf
    • https://cdn.shopify.com/s/files/1/0460/1502/1223/files/41192118553.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/enough_adjective_noun_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/7409/2198/files/jutupuvagaxoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/71305446280.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_off00006b1c.bin
5908f7e3838af9f4b1cb5512d484d649d5fb1eb716a25347b46a8f918c229ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1C 5356 bytes
font_01_sfnt_off00007d2e.bin
0d2d9004fb77402aa494e0c396dafa5e2f683bd4ac7d10ab816d294dcf6ee2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 10484 bytes

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