Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fde4b8f15580fb…

MALICIOUS

PDF

86.9 KB Created: 2020-11-03 22:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a26dd6885f8da4808a41f1203bc08ef SHA-1: 1c8e088750a5fe2e1eed2d613b2a6a92e95573c5 SHA-256: 79fde4b8f15580fb9c94d954623e9ee08ec64a79ae7079593c0bcffbeeac0fc1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for 'biology holt mcdougal online answers' and is flagged as an advance-fee scam. It also contains a link to a known malicious redirector, cctraff.ru, which is likely used to deliver a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for fraudulent purposes.

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://cctraff.ru/123?keyword=biology+holt+mcdougal+online+answers
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5f8f095064e3b.pdf
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f938ec3963b6.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f89bff67ffc3.pdf
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f957cb64a8fc.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/f6ffa7e1a9c6.pdf
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5f8b1933db10d.pdf
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fa03117d877c.pdf
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/26726d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/1110375375.pdf
    • https://s3.amazonaws.com/xilasisefi/44894761216.pdf
    • https://cdn.shopify.com/s/files/1/0482/4606/3258/files/57543408014.pdf
    • https://s3.amazonaws.com/rovikibixu/rosokuladesadane.pdf
    • https://s3.amazonaws.com/libeganot/educational_agencies_in_nigeria_and_their_functions.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_off000117ad.bin
f3375c2e4c00f4fbaf27b7c4d39b3d3cdb9eecd25e77594744452bd8787a3d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 5596 bytes
font_01_sfnt_off00012a9f.bin
080aeb37a8bb07d82ffb48bbad48b2c11220c3beb202deeb3ec33a76e9e6acc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 10512 bytes

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