Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef271a9cbeac9f…

MALICIOUS

PDF

46.5 KB Created: 2020-08-10 08:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a32bffc1ae67ffbe283d98624d6f4c3e SHA-1: ffb3bd00996daa285b38aaeedde2d7ea3d607f84 SHA-256: 0cef271a9cbeac9f6524fdaabcb709c14fbf0a75f27a2b64ff67b8f9dc963eaf
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a likely attempt to direct users to malicious content or phishing sites. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links, including a redirector, suggests a malicious intent to lead users away from the document to potentially harmful destinations.

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=cost+accounting+summary+notes+pdf
    • http://files.synbim.co.uk/uploads/1/3/1/4/131438899/236290.pdf
    • http://files.rockthecatspa.biz/uploads/1/3/1/8/131871571/xijofisewib.pdf
    • http://files.designingloveandstyle.com/uploads/1/3/2/6/132681985/zawofaveroxobazo.pdf
    • http://files.karenglinski.com/uploads/1/3/1/3/131384442/komixevepidas.pdf
    • http://files.menomineewatershed.com/uploads/1/3/1/4/131453950/rugewoxiwumerafokura.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/39053875995.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/61539729137.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/63161667277.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/wunufugopakavaralek.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/vugunubirosoxekigez.pdf
    • https://cdn.shopify.com/s/files/1/0450/6117/7507/files/ap_sachivalayam_digital_assistant_notification.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/taxetoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/39967889075.pdf
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/dinujibafoxegike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99324429390.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/58690082613.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/231428144.pdf
    • https://cdn.shopify.com/s/files/1/0443/7049/3596/files/airman_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/24627211532.pdf
    • https://cdn.shopify.com/s/files/1/0440/4055/2598/files/alienware_15_r3_specs.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_off0000782d.bin
60700cddbdbde4086b00ad8d777588800472c2af82d04fb2fbcb111b5359cd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782D 5448 bytes
font_01_sfnt_off00008aa6.bin
7e470d9adbe42a0a4f61365fcc6abc234bfff25f99508905e8517d9e4180592d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA6 9836 bytes

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