Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa83ba311332043…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 12:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb479c385ac0c2a38750ab7790e8ec3d SHA-1: 2035fd837ce14aab3427d04e182bf4e9d664ecc3 SHA-256: bfa83ba311332043bc456b9da3e6903384011b8f07409259e7b29c0b23c08518
154 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.com/wb?keyword=blank%20sheet%20music%20template%20pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to disguise the malicious redirect. No scripts were extracted, but the malicious link is sufficient evidence for the attack pattern.

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/wb?keyword=blank%20sheet%20music%20template%20pdf
    • http://files.piedpipersfarm.com/uploads/1/3/1/8/131871535/lowusagemuwiz.pdf
    • http://files.bournemouthjrc.co.uk/uploads/1/3/2/7/132710690/9372aa38a85.pdf
    • http://mosodup.ghizalhasan.com/uploads/1/3/0/7/130739591/cbef9cf4dd9.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/avl_tree_code.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/wuteru.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/11637300198.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/lidumuwemaxejazikujoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7528/files/kickboxing_training_drills.pdf
    • https://cdn.shopify.com/s/files/1/0428/3016/8230/files/juruzepakofanipaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18842325712.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/kanipej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/semupalobarobofigosegoru.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5636/files/67471412334.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/75662030149.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4050/files/shell_script_array.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_off000060fa.bin
54c713633bf7fa6f6bf7420afaa5f21be9ad8b5f8e38c502a9d90af22188d5a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FA 5412 bytes
font_01_sfnt_off0000733e.bin
ec75cfbd68416cb3d23afa5f40770698d53b5e3b5d31eb0fa0dba96496894c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 10316 bytes

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