Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f643282de9097d4…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 09:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de429a22fc6bbbddd88dbfb1a35d6e4a SHA-1: 298eeebee9165fd508f7f85e95310f7ba88c504e SHA-256: 1f643282de9097d434a330ae87bee30b2162460aab6d616a4fd77d2855938e2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a lure for 'astrophysics books for beginners pdf', and the malicious URL is embedded within this text. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, likely to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

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=astrophysics+books+for+beginners+pdf
    • http://files.nourishnotdiet.com/uploads/1/3/1/4/131438217/refobofopasud_ludobivunudoduk_pinekew.pdf
    • http://gilore.alyssahchase.com/uploads/1/3/0/7/130739024/tosodekozunux.pdf
    • http://sedoxasen.biggleswadesquash.com/uploads/1/3/1/4/131406390/3ff6b.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2156/files/water_logging_and_salinity.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/baixar_24_em_pt_br.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/22576315388.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/87052928651.pdf
    • https://cdn.shopify.com/s/files/1/0429/6343/5679/files/34559687763.pdf
    • https://cdn.shopify.com/s/files/1/0441/2188/2776/files/risegimosuju.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/46916766966.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8504/files/sidujapavaraxumaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/senadeka.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/mawoxotapumutaxij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/wobivukalazetusunomomoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/pasidonozajedilax.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/tatel.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ae.bin
4edf5af3b0d9f270e8be63c1a9631f4d28cce237b010603eafedbfce98a54260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 5468 bytes
font_01_sfnt_off00008551.bin
6384196fcb122f076e04adf52b7d9f1d622b5cb17984d4f8e765e9c4bf3e5641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8551 10120 bytes

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