Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b494e57c914090…

MALICIOUS

PDF

47.1 KB Created: 2020-08-24 04:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fff0ff818f76ae87bcaf3fce64547d1 SHA-1: 1b158da10861a14bd15c8ac86454baeb56999886 SHA-256: f1b494e57c914090840b6f1fde70f00d75b4019935eb5063e9c862e31fdbed06
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to external PDFs hosted on various domains, with one link identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=anhui+conch+cement+annual+report+2016, which is also flagged as a malicious redirector. This suggests a campaign focused on link farms or SEO manipulation to distribute malicious content or redirect users to phishing sites.

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.com/pify?keyword=anhui+conch+cement+annual+report+2016
    • http://zilufelug.nationalriskmanagementgroup.com/uploads/1/3/2/3/132302921/9361426.pdf
    • http://files.behaviormarinselpa.org/uploads/1/3/1/4/131406049/fituzixotelelezos.pdf
    • http://files.alioleary.com/uploads/1/3/2/7/132740352/8938471.pdf
    • http://gokeveza.maptco.com/uploads/1/3/2/6/132682883/9358148.pdf
    • http://vuraxis.orproviderrelief.org/uploads/1/3/1/4/131407995/2524882f.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/35661420150.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2436/files/fundamentals_of_electrical_engineering_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/6224/8102/files/93804586603.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/99703525831.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/62116892132.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/zijapetanixiwosojoges.pdf
    • https://cdn.shopify.com/s/files/1/0428/9724/4316/files/ubuntu_16._04_repository.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/vakarexepefenuvezav.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/fuvekop.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cd5.bin
d67c3de170d2789bcd493d0ea99775dafb114350ee70e4d82e6a120efaf41af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD5 5084 bytes
font_01_sfnt_off00006e94.bin
ea7c25e98e70aa201e74bf091450261c06c3f7aea204910962a07dfc64789064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E94 5464 bytes
font_02_sfnt_off000080f3.bin
7195c194d60234b93a4f96bcaa33d3d65354b12730e78aa3f1d9ea49d2591aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F3 14040 bytes

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