Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739e71893e03d77…

MALICIOUS

PDF

43.3 KB Created: 2020-08-24 00:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6668ba9eb5af6dd2bf4ae1db0dbeb2b SHA-1: 02993b3c90167addd40b711c83ff03aa694cb226 SHA-256: 6739e71893e03d774f694303ef4a2de7b47633dd3d57e0b106be50800ade80e8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed to host various PDF documents. One prominent link, 'https://ttraff.com/pify?keyword=in+lawfully+yours+parents+guide', is identified as a malicious redirector. The document body, though partially obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious infrastructure.

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=in+lawfully+yours+parents+guide
    • http://files.angelsof97.com/uploads/1/3/1/3/131398374/ribezap.pdf
    • http://mazoxi.drnatedmond.com/uploads/1/3/2/7/132712207/redokene-xumub-ritifubasomo-gofapo.pdf
    • http://sobitipo.knockatallonns.com/uploads/1/3/1/3/131384260/1e36ea7b828.pdf
    • http://files.isetnb.com/uploads/1/3/0/7/130739340/1338399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/38021594103.pdf
    • https://cdn.shopify.com/s/files/1/0451/9283/9317/files/igcse_biology_revision_notes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5203/files/zijijixawosujoruwezeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/dso150_digital_oscilloscope_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2254/files/dizoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3152/files/68648550761.pdf
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/66089099704.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/dogofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/tsa_cbt_practice_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/2616/7461/files/spoken_english_for_business_communication.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/bobupevag.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_off00005e5b.bin
216847ee3d0297f320b450fa17fc667fb95b65ee64993345548df73f88fbd0b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5B 5220 bytes
font_01_sfnt_off00007044.bin
8494323c02e39c6aff6a61640e5fad8e2ec7e627a44814031cfce8501c4d6ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7044 9912 bytes
font_02_sfnt_off00009222.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9222 4324 bytes

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