Malicious PDF — malware analysis report

Static analysis result for SHA-256 661c9849b859af5c…

MALICIOUS

PDF

44.9 KB Created: 2020-08-17 11:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5342533c08235c209634b0621567f6bd SHA-1: 49f37394e7ecace5374a0f7e7fa93444730f12b6 SHA-256: 661c9849b859af5cb297952b974867e9de9d427a4195ff1c3eb6bee3d9dfbf07
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body and heuristics suggest an advance-fee scam or callback phishing lure, aiming to trick users into clicking the malicious link. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=aditya+birla+capital+insurance+policy
    • http://files.davidfunkpainting.com/uploads/1/3/0/9/130969655/kizevevuwu_bopedebovufeso_moporobinibe_bukakaxobugage.pdf
    • http://files.conresnet.org/uploads/1/3/1/4/131437657/bujetimonufigemipiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/how_to_uninstall_microsoft_office_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/18971153631.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/8448746350.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/11887161504.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/acrobat_professional_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/26252356119.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/giduzixudala.pdf
    • https://cdn.shopify.com/s/files/1/0430/9775/1709/files/statistical_learning_springer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632c.bin
6bf2c9ae1b75d7b42bbdf45bdcc2a8690ebc06272a56e61f248748221d15d611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632C 5180 bytes
font_01_sfnt_off000074ce.bin
1a11839f125c1db7ce24bcf2b3e5ec1e0435ae4c6da6fcded8178a0b500ecb1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CE 10568 bytes
font_02_sfnt_off000098e6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98E6 4324 bytes

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