Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dafd5fe2f22dc46…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11019a77b21b69e2a6940efae2739e17 SHA-1: ba5eed63b16261b7e8beab0174c4500d23934154 SHA-256: 9dafd5fe2f22dc4663b0bbb98ccfaeafb5d8ca969a89ac43a8f872d94148a138
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, directing users to 'https://ttraff.ru/wb?keyword=house%20of%20gold%20piano%20pdf'. This URL is likely part of a SEO poisoning or spam campaign to drive traffic to malicious sites. The document body also contains this URL and other Shopify links, suggesting a lure to download potentially malicious content. The ML classifier also strongly indicated 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.ru/wb?keyword=house%20of%20gold%20piano%20pdf
    • http://files.saludabaptist.org/uploads/1/3/1/4/131453245/nukuxa_domidafawaza_kabanemoz_mukategalapu.pdf
    • http://files.claireallegrataylor.net/uploads/1/3/0/8/130814611/dilomupab-tizoxarewavet.pdf
    • http://files.page28music.com/uploads/1/3/0/8/130874683/1ffab1956.pdf
    • http://files.rosanaourens.com/uploads/1/3/1/4/131453574/7de7b.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2536/files/98117269912.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/kuxox.pdf
    • https://cdn.shopify.com/s/files/1/0433/5891/2662/files/best_open_source_reader_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/5425/0654/files/benetuki.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/26492698050.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/xisudidizo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8242/files/9471755517.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/jativaviginigofuxilinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40573574370.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/gulurazefupowuroga.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6615/files/log_transformation_in_r.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_off0000715c.bin
e29efd2d9b7a876a8a22b5cb897d5eeac5d586e2d242515dd171c9218d616fa7
pdf-font-stream PDF embedded font (sfnt) at offset 0x715C 5072 bytes
font_01_sfnt_off000082b7.bin
68d9ea5e2a614185420d0bdf5b57a53f03aa679f308282019fa25af5b9c2c651
pdf-font-stream PDF embedded font (sfnt) at offset 0x82B7 15728 bytes