Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f483bf69c0a1136…

MALICIOUS

PDF

43.0 KB Created: 2020-08-14 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49e85b6db1edc5d300708ae80b05d6e8 SHA-1: 87a202d720dc1c376743561563ecb054024af142 SHA-256: 7f483bf69c0a11363cc293bf79f6a2078d3ae37502cb45ab71569580f59ab476
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they are involved in a lottery, prize, or parcel delivery scam, which is a common advance-fee fraud tactic. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely serves as the entry point for the scam.

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.ru/pify?keyword=browser+android++video
    • http://files.texasartteacher.org/uploads/1/3/2/6/132696044/lututedegavapus.pdf
    • http://zulegova.2020hawaiishirts.com/uploads/1/3/2/8/132814930/ff06aa1df4.pdf
    • http://files.ashleyscleaningservice.org/uploads/1/3/0/8/130814070/5765236.pdf
    • http://mimevi.unitedchurchofhuntington.com/uploads/1/3/0/7/130776436/c2f8b817b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5913/4112/files/tudovobudufisomawoxovo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/61282453026.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/giulio_argan_arte_moderna.pdf
    • https://cdn.shopify.com/s/files/1/0434/7976/1061/files/tedijolonoloverorer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/estrategias_de_aprendizaje_concepto.pdf
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/bolzano_weierstrass_theorem_proof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/42350734659.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/ic_cd4013.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/acupuncture_for_ivf_and_assisted_reproduction.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/tf2_unusual_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/90053854342.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/hematology_cbc.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/vomoxevujo.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_off00006987.bin
b030541af02d0c712dee8f267900e1d1319ab1d04897539b9fb7391c5cb5847f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6987 4988 bytes
font_01_sfnt_off00007aa5.bin
a97d077f9e8a7373bcd06ae08f6c45b59cdfe70f4f347fef11debbb38cf61d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 10740 bytes

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