Malicious PDF — malware analysis report

Static analysis result for SHA-256 2832d856c72cd298…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 08:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2419c275ab3b41c1f418f7fe6aba629d SHA-1: c2e1f8c47e92290910a914d9c37a35c3826c7d22 SHA-256: 2832d856c72cd2981d66aeaa0a8a2041ca2a2a0f37add6585476b40f11dfd7ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to lure users with search engine optimized book titles. The primary redirector URL, https://ttraff.ru/pify?keyword=dr+br+ambedkar+books+free+download+pdf, is flagged as malicious. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL analysis are sufficient to determine the malicious intent.

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=dr+br+ambedkar+books+free+download+pdf
    • http://files.dublintaiko.com/uploads/1/3/1/4/131437530/dbad835a.pdf
    • http://files.illinoisdelta.org/uploads/1/3/2/6/132681938/2186787.pdf
    • http://files.authorseanmacuisdin.com/uploads/1/3/0/7/130740521/batemede_vidugerekon_gudoli.pdf
    • http://drambedkarwritings.gov.in/content/w
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/doxuzofib.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/69645710645.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/52375599100.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/vogotirumaxapediraba.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/58595542764.pdf
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/81764872312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/79756658648.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/708918392.pdf
    • https://cdn.shopify.com/s/files/1/0434/2104/0792/files/6222516841.pdf
    • https://cdn.shopify.com/s/files/1/0449/8269/8142/files/emac_graphics_card.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/94778091157.pdf
    • https://cdn.shopify.com/s/files/1/0435/4539/5368/files/dobipejokitivowedozoxew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/51908062409.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616e.bin
e23d1d2d111f7388b2b2e14c174a89d7ab36d4b7d85779fcc39578dc26d8c2f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 5480 bytes
font_01_sfnt_off00007408.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7408 1800 bytes
font_02_sfnt_off00007c98.bin
b029665989900c88c342d5a5a1a082363f3667dda823c053706bbf163a116fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C98 10352 bytes

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