Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aa92aab3d7f92d…

MALICIOUS

PDF

38.8 KB Created: 2020-08-16 18:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83095d2c5daca7516668b375c8786ec8 SHA-1: 5c90e331ff25a7d41359cb930c8d3a75341418c9 SHA-256: 16aa92aab3d7f92d475c713bac2f03b41d572e91c1b77d212b7ccb492f68bc6f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to lure users to malicious content, potentially for phishing or malware distribution.

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=exclamation+sentences+worksheets+for+first+grade
    • http://nawuw.emilyhuntermft.com/uploads/1/3/1/3/131379362/mapakinunuxojat.pdf
    • http://files.us-history.net/uploads/1/3/1/4/131482822/jegekokegu_mipepitalitak_pepib_netorokibuzol.pdf
    • http://pusagepal.littleflowerrugby.org/uploads/1/3/0/7/130738714/xewukuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/45496698754.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/basketball_ground_rules.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/43533182240.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/soladedolabaduporu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/repagurife.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/sexagor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/48622844574.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/idioms_and_phrases_with_bengali_meanings_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/lineare_gleichungen_bungsaufgaben.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_off00004ba7.bin
662baa5ea11c96f618e40fee96888d895e6422c6886bce41828240eee5f85d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA7 5404 bytes
font_01_sfnt_off00005dee.bin
83cee2d16105ddf2d56ea7341909fa5cff41fdf241cf4b2c98587717792bf1f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 10024 bytes
font_02_sfnt_off00008030.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8030 4324 bytes

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