Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf7343ed88fcbc…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c659396f427b676f1f21a75c0c4ef4 SHA-1: 2dfd8614eba7f1247beac553f4b31ac76391cf2d SHA-256: 5daf7343ed88fcbcd313f7ab4273097d24c5aa298befbb2d6cdea09f331d1c5c
154 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to potentially malicious redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'free google hangout'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a link farm, leading users 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.cc/pify?keyword=free++google+hangout+for+laptop
    • http://files.valuetrainsusa.com/uploads/1/3/2/7/132741144/nopeja-pukanizepubajo.pdf
    • http://files.heartfeltwoolexpressions.com/uploads/1/3/1/4/131483019/movotowonedafamime.pdf
    • http://fejus.langfordlab.com/uploads/1/3/2/3/132302782/2903468.pdf
    • http://files.cecilyeiferle.com/uploads/1/3/2/6/132681460/d59f0d68b015fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6395/7914/files/download_hallelujah_chorus_tonic_solfa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/amaranthe_album_rar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/kaufland_letk_sk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/verizon_cancelling_contract.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/68578809242.pdf
    • https://cdn.shopify.com/s/files/1/0432/5389/1232/files/kannada_sex_stories.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/19408795341.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5819/files/verogazixavope.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/jajigezuzananowoviture.pdf
    • https://cdn.shopify.com/s/files/1/0429/2267/2284/files/vigisomilotoveputebuba.pdf
    • https://cdn.shopify.com/s/files/1/0438/9853/6091/files/53610671588.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/46302617018.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_off0000631a.bin
e8811e1a1fa103847d9538da1cd23ff77377a120dba8fcbd465d5b2cc0348874		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 4940 bytes
font_01_sfnt_off000073e7.bin
bc6093b41cd0c3c69534c7dc10e181ea716bc554a2e23bb6134b7698e7ff6051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E7 12080 bytes

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