Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e4a6cfa3f2e4c2…

MALICIOUS

PDF

42.4 KB Created: 2020-08-22 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd48c479363c9fc5ab23d1a424a5ee10 SHA-1: 4ce90535a4903d2d6fb2113125ceac32c1b35246 SHA-256: b9e4a6cfa3f2e4c241e03f5799bd172bab1b46335fbad1e03b1002d42acbf947
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, forming a link farm. One of these links directs to a known malicious redirector infrastructure (ttraff.com). The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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=contrast+in+art+worksheet
    • http://files.bornofsinpits.com/uploads/1/3/1/3/131398144/zevamegifepupegu.pdf
    • http://files.clareandkatie.com/uploads/1/3/0/7/130776445/0d2739f10c9bf13.pdf
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/54838998785.pdf
    • https://cdn.shopify.com/s/files/1/0436/0486/9277/files/14934928142.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/demanaziz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/47487612683.pdf
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/build_self_esteem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2344/0799/files/xulevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7505/files/minecraft_pe_id.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/zizijalevoratokanamol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1712/files/7731284680.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/tajivawulimiruku.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/devi_bhagavatam_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/junuzaxegexofefolibo.pdf
    • https://cdn.shopify.com/s/files/1/0451/3090/7813/files/caricature_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15750122344.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_off00006065.bin
57784f950e4821ec1638511025705f7024bb902146dcb96f650f67fb82d83db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 4800 bytes
font_01_sfnt_off000070b8.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 1800 bytes
font_02_sfnt_off00007946.bin
ea047fa6743077b56b264ad198ed8430f60ecd935d0ae457246fc9b2950142c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 10300 bytes

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