Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df4b692aff075d6…

MALICIOUS

PDF

66.4 KB Created: 2020-08-27 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3df126207db7d75f12de6e31f40bfda SHA-1: 08bb61f555ef0ad987cff29a39e61250ad493706 SHA-256: 5df4b692aff075d61b3cc2576933a2b2cf57f4dc538073d54859c18edf77b3da
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the title "Wrx sti mod guide" and the malicious URL, suggesting a lure to a malicious site. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.me/pify?keyword=wrx+sti+mod+guide
    • http://files.scottpreciousmetals.com/uploads/1/3/0/7/130740213/8195174.pdf
    • http://vawovuvax.writedownmemorylane.com/uploads/1/3/0/7/130740514/megiguwu_xetovunorolov_taxidinoguju_dojuronemezagej.pdf
    • http://files.info-integratedtherapysolutions.net/uploads/1/3/2/3/132303286/8492154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/46285714566.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/82058228820.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8035/files/19816584700.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/22311439809.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/dujilipu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/89373634687.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/kitoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/fopewugalanemugi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4535/4658/files/45866523993.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/bizumikut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/kubota_bx2200_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/43871629221.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_off0000c6b0.bin
9336dff51114209227e65ba188ef4e1592bc436936eccc94c51d02c6cfa807fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 4984 bytes
font_01_sfnt_off0000d799.bin
18e08d4a4cb4094cee2da6cbf2e6adf18a4f63ce5cd865132c5ed898eb323b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 11020 bytes

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