Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a40517e75593b43…

MALICIOUS

PDF

38.8 KB Created: 2020-09-01 14:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d30fd7c7a8223eb6b9c232ec91959ec SHA-1: 525eaeb429882be2217367da0202d8c98e68aa0f SHA-256: 7a40517e75593b430aa67c82f05903e16b23197d9e2cc1c039e036a232d52032
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains text related to 'financial accounting mcqs' and the malicious URL, suggesting a lure to trick users into clicking. The presence of numerous external PDF links further indicates a link farm designed to obscure the malicious destination.

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.link/wix?keyword=financial+accounting+mcqs+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0c268c_aae53919bbfe42da80e72430124ca311.pdf
    • https://static.usrfiles.com/ugd/83f04e_c9ec50d72f9a4b85add4cf3e93b0e90b.pdf
    • https://static.usrfiles.com/ugd/0dd040_f5abff0f2a2644bfad427884e2526c85.pdf
    • https://static.usrfiles.com/ugd/b8c837_439ca287ba404a629e4fd1e99a16ca19.pdf
    • https://static.usrfiles.com/ugd/d1c05f_a08715ddbdba4879a329dcb826857d05.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/similarities_between_meiosis_and_mitosis.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/74188102413.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/morphology_of_flowering_plants_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3990/files/51305895096.pdf
    • https://cdn.shopify.com/s/files/1/0431/0060/2525/files/briggs_and_stratton_generator_5500_m.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0801/files/23180005145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/witinimajugawix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/gejowiwijumipifajakupobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/6969186570.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/clarkston_washington_weather_report.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_off000058df.bin
4dc9517b6279189cbb36e49bb87147f074534d41e394d7f93d8380b5de681035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DF 5740 bytes
font_01_sfnt_off00006c45.bin
06d2448f39106c71930eb66f3dfd0828ca5055b23e8f38409508d3423ef44d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 10064 bytes

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