Malicious PDF — malware analysis report

Static analysis result for SHA-256 632aec9030c8c542…

MALICIOUS

PDF

45.4 KB Created: 2020-07-30 05:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 736d00a23867008d7a2908233d206875 SHA-1: e1b6b27f60f8de9adb88d4e1ff30d82a1d2f2226 SHA-256: 632aec9030c8c542e4a44b84eb386c7e0201c34aa0f3019d916e006a8d0030c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is `https://ttraff.cc/pify?keyword=ielts+academic+reading+practice+test+with+answers+pdf+idp`, which is likely used to redirect users to further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links suggests a SEO poisoning or link farm tactic.

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.cc/pify?keyword=ielts+academic+reading+practice+test+with+answers+pdf+idp
    • http://files.theazphoenixsoldiers.com/uploads/1/3/0/8/130874667/bosazasovokaz.pdf
    • http://files.kathleenrhee.com.au/uploads/1/3/2/6/132696465/sopaminolobix-jiwawesoje.pdf
    • http://files.mindfulandpresent.com/uploads/1/3/2/7/132741382/sigupedepefokegadu.pdf
    • http://files.tileideal.com/uploads/1/3/2/7/132740399/lafip.pdf
    • http://files.apwcsa.ca/uploads/1/3/0/7/130776268/cf75227935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/28062801648.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/momiwijinazabos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/78875015363.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/62312713154.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/47017189344.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/nelabumosopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/furibinotevakeravobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/vojevuluwi.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/74506543937.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/jedasevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5960/0798/files/zifomabobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/56812448996.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/mutan.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/nojegitalujemakefodulegi.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_off00006e4d.bin
2168212e5228acabc8b63595972d4e271939d2bebda2cebe4c260b78c00c28c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4D 5276 bytes
font_01_sfnt_off00008015.bin
edc6455de854791faafe82706a2c11b30c468460548d4a6a2db3bb2683e48272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8015 14752 bytes

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