Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd70f40c8b1ce4d…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 05:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fcb26b313271db508110447f30c755a SHA-1: 9fec3f500e9abe15fa597b66fade45dca70509c9 SHA-256: 0dd70f40c8b1ce4df2441c3b7ab601f9eaf415c7b4e55ff1d0db8af0917c2a0a
174 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content. The document body, though partially corrupted, contains the malicious URL and suggests a lure related to learning English, which is likely a pretext for phishing or malware delivery. The ML classifier strongly flagged this PDF as malicious.

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.
  • 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=segredo+da+flu%25C3%25AAncia+como+aprender+ingl%25C3%25AAs+com+m%25C3%25BAsica+pdf
    • http://files.katetrepagnier.com/uploads/1/3/0/7/130775084/1185668.pdf
    • http://files.seatrunks.com/uploads/1/3/1/6/131607063/tevejulofufalatof.pdf
    • http://files.stella-luna-charms.com/uploads/1/3/0/9/130969623/bilinurejupeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/wenefixajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/vifizin.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/63267873933.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/18345328142.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/73387211961.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/human_biological_diversity_brown.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/campbell_and_reece_biology_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0948/2658/files/37732101506.pdf
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/tugupemoziwitafakisin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/google_play_on_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/31351126748.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_off00006170.bin
72946f8e8d8bd3f04fb391a8c548883292b6ec14ea4dbd6293b8a13633581cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 5844 bytes
font_01_sfnt_off000074ca.bin
994830be2bc8a377479e6d7f5c1899bcef4cf2a69d4b4c470ceb0abe198df31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CA 12452 bytes

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