Malicious PDF — malware analysis report

Static analysis result for SHA-256 1966a7a0a0b932e6…

MALICIOUS

PDF

46.8 KB Created: 2020-08-03 10:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66ec613139a56836670991390d4c3917 SHA-1: a64951ebe492725b9646de25fc47d357ea4ba186 SHA-256: 1966a7a0a0b932e68f15ec2bbd00250306244a2f7f2939e01aee823f8e269cba
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a "decimal to fraction converter". The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading users to click on these links.

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.ru/pify?keyword=decimal+to+fraction+converter
    • http://vajob.hearthandcaravan.com/uploads/1/3/2/6/132695384/e100d4de.pdf
    • http://files.meanevilstepteacher.com/uploads/1/3/0/7/130776714/sojotonuzedojozuk.pdf
    • http://files.victorystrengthandfitness.net/uploads/1/3/1/4/131482915/6471630.pdf
    • http://files.virginiafilippousi.com/uploads/1/3/1/4/131454102/1052853.pdf
    • http://files.mylgtg.com/uploads/1/3/1/6/131606874/mizawoxixere-fulamuzuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2024/6427/files/84621045086.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/72006760207.pdf
    • https://cdn.shopify.com/s/files/1/0434/2906/8949/files/pevikitaxefozoze.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/58920235795.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/93254438640.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0263/files/8617884586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/jininagulirefawinep.pdf
    • https://cdn.shopify.com/s/files/1/0443/0761/1804/files/fitgirl_28_day_jumpstart.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/8n_ford_tractor_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/72501019443.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/guzomazugomurufadebifame.pdf
    • https://cdn.shopify.com/s/files/1/0439/3215/6059/files/83126035612.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/93936966670.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006617.bin
edae7cedc11ec3aeeb5e010e951930b2bb0c34d60da3d245b30f7be4afae1d80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6617 4696 bytes
font_01_sfnt_off000075f0.bin
ea912b02e2bb01d400eb0f5cf755bc54c09f408c5133290cab60e4672568cb73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 13048 bytes
font_02_sfnt_off00009fa1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA1 4324 bytes

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