Malicious PDF — malware analysis report

Static analysis result for SHA-256 11baaad5b80a225d…

MALICIOUS

PDF

55.8 KB Created: 2020-09-04 01:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1243affc50670e06418929423a777225 SHA-1: dac5c1565e8bd86ff70e815944ff53ae689e4874 SHA-256: 11baaad5b80a225d80c6d2edeeb25645fa9b7d0491dd97ac737b37083ac68339
182 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a software download, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further indicates malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead the user to 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=messenger+for+mac+10.+6.+8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bc84a3_8ad0f936b88646c9a9423fd575acbaf3.pdf
    • https://static.usrfiles.com/ugd/e23fbb_b82b5dd8df6a4d15a052590b29037715.pdf
    • https://static.usrfiles.com/ugd/b56239_dd2ceff34cd24da4b39c95b3540d3cbf.pdf
    • https://static.usrfiles.com/ugd/a43ec6_aa2d1d33ed8f44c1a7708825233c70ad.pdf
    • https://static.usrfiles.com/ugd/805d2a_095c6f3fc7c14b958f2bde69cc745de1.pdf
    • https://static.usrfiles.com/ugd/b8c837_25543622b9ae4d07bb1ea74336628cf4.pdf
    • https://static.usrfiles.com/ugd/04e6f9_55df7ef3512341a8b41259635a67e159.pdf
    • https://static.usrfiles.com/ugd/b8c837_c207b765a0f34def87e54e84cc07233c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4737/files/stewart_calculus_4th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/carnatic_music_basic_lessons_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5621/files/15553341744.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/digestion_and_absorption_of_carbohydrates_lipids_and_proteins.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/mallu_kambi_kathakal.pdf
    • https://cdn.shopify.com/s/files/1/0439/5443/8302/files/1800987735.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43181801848.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_off000098ea.bin
acf2e08a959cedc169461a5373c4174584ba338d34cf0207d5f4b1514126b4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98EA 5748 bytes
font_01_sfnt_off0000ac7a.bin
c5295d07089f33fbc573c9225ce46039fa2fe7bbff3c6a6a6c017c015ccb07d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7A 10992 bytes

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