Malicious PDF — malware analysis report

Static analysis result for SHA-256 1148537e0d466ca5…

MALICIOUS

PDF

38.1 KB Created: 2020-08-13 10:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4b21047de33cdec1d81e47d3d2c295 SHA-1: b500b4498ac8075c63d42220003f897b4a4b6b53 SHA-256: 1148537e0d466ca548fce4626b1da2c3aefba5a4192996cf4d8f16cc8fe36dec
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for distributing malware or phishing pages. The document body, though heavily obfuscated, contains text suggesting it is a worksheet answer key, which serves as a lure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify, suggests a link farm used for SEO poisoning to attract victims.

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/wb?keyword=proportional%20relationships%20and%20graphs%20worksheet%20answers
    • http://files.osdarmembers.org/uploads/1/3/1/3/131379639/4328b69703.pdf
    • http://files.kanimambocreations.com/uploads/1/3/1/6/131637186/df7f91095.pdf
    • http://files.whitesschoolfordogs.com/uploads/1/3/1/4/131438759/fejomavukezav_winuzotilitodux_zigim_negarori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/82645026957.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/whole_circle_bearing_and_quadrantal_bearing.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/jugazigewojanurepejufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kekiwimuzavenomudajelibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/51339219068.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/unfair_dismissal_appeal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/kejaxafekujudap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/karcher_power_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/git_stop_tracking_remote_branch.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/pmbok_guide_6th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/tepuzifim.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_off0000568d.bin
8a500a6b09c6ba191e927b9ded0ebd3f8c10a0a900807d72f479719edc7328ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568D 5380 bytes
font_01_sfnt_off000068d2.bin
1249df309ce37abf10c3223900c2a0494195180f93ac5dc0cc55323401f0e891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 9896 bytes

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