Malicious PDF — malware analysis report

Static analysis result for SHA-256 429fb578c387c143…

MALICIOUS

PDF

43.2 KB Created: 2020-08-20 21:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c551ea33273d215cc65d351d48d7793 SHA-1: a5d9ce148c616d26b7680c6d10275057f96fc2c9 SHA-256: 429fb578c387c1435914db9f3e08fad5b5e42b554938937e912b82da50caf89e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=android+phone+bitcoin+miner'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of embedded links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=android+phone+bitcoin+miner
    • http://files.mrhibbert.com/uploads/1/3/2/6/132695986/gunoreg.pdf
    • http://files.blueheronpoetry.com/uploads/1/3/2/6/132681829/3777939.pdf
    • http://konerolos.laraknutson.com/uploads/1/3/0/8/130874038/dizezadodoxaf-babik-wogipojokuk-giwevunudomutab.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/nexumegu.pdf
    • https://cdn.shopify.com/s/files/1/0450/3732/2390/files/65672142240.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/migos_songs_baseshare.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/49574435337.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/60132076349.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/92035670515.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53681635306.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/cancelling_verizon_fios.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/nararefepajod.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/lowes_warsaw_indiana.pdf
    • https://cdn.shopify.com/s/files/1/0439/9602/0894/files/ciclo_biologico_del_trypanosoma_cruzi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/how_to_rebuilr_the_netive_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/ruzatuzubizedivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/c_sql_database_tutorial.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_off00006b3d.bin
9bc9146663193e278c6acee4a9b1683c85dd4ba8e5c743e85eb1b49cba7c815f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 5020 bytes
font_01_sfnt_off00007c19.bin
ccbb697ecb4d4159270791c488d5810d25bf681143b7538a801e1285aa56763d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C19 10524 bytes

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