Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bb57ac7f4853ad…

MALICIOUS

PDF

38.7 KB Created: 2020-08-01 10:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10092dc14e55edca1e0abb60e7e7917 SHA-1: cddcdae3bfa96071ecd33128caa5addd15122a9b SHA-256: 64bb57ac7f4853ad5b188ab59d7abcc51946b6941bcb90ffb49269506b703858
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for "Kohler oil filter cross reference" information. The presence of numerous external PDF links suggests a link farm or redirection strategy. No scripts were extracted from this sample.

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=kohler+oil+filter+cross+reference
    • http://files.zenithbirthservices.com/uploads/1/3/0/9/130969436/c07ba1.pdf
    • http://files.oakgrovechristianschool.com/uploads/1/3/0/7/130776864/db7561d7be70.pdf
    • http://files.pointpleasanttradingcompany.com/uploads/1/3/2/7/132740515/posaguzavax.pdf
    • http://files.kathrynvbrinkman.com/uploads/1/3/1/4/131412558/munuwitunavaxuwesid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/65079867909.pdf
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/19575796080.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2320/files/68481102221.pdf
    • https://cdn.shopify.com/s/files/1/0439/7914/5374/files/44476284731.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7367/files/3123012811.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/gizulamuzofiduziwuvuwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zudofujavulasosajawigubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lovukapovilelogitolosir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/tumuzug.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/98489176980.pdf
    • https://cdn.shopify.com/s/files/1/0429/5619/3955/files/dolavanurisumogonexame.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/70424503210.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/97339036920.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/54417294107.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_off00005122.bin
29348924f4f585fd4b8519b3692146f726f5ae5bb4dfc3466a0532bd0287e40c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5122 4728 bytes
font_01_sfnt_off0000613f.bin
4cf3799fb324ef6cce90309590f34f89feca69c6f7394796dd100034b0eb74e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 14032 bytes

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