Malicious PDF — malware analysis report

Static analysis result for SHA-256 5671f944b61fb6ed…

MALICIOUS

PDF

43.2 KB Created: 2020-08-25 18:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b40ba3e6e38b9a2a077000877ce81dc SHA-1: f8202f0a2fd62e2441f2b006bf02251f9fcb8c6b SHA-256: 5671f944b61fb6edc93dfe5879db73c1e8e757c6e08962d67ec152a8d3542b03
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a high number of embedded links. One critical heuristic identified a link to a known malicious redirector (https://ttraff.cc/pify?keyword=the+gingerbread+cowboy). Another heuristic indicates a PDF link farm, with many links pointing to external PDFs hosted on domains like cdn.shopify.com and other potentially suspicious domains. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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.cc/pify?keyword=the+gingerbread+cowboy
    • http://ketaw.plantedparenting.com.au/uploads/1/3/1/4/131412290/nuwored_nuxefu.pdf
    • http://files.lushbingoslotoffers.com/uploads/1/3/2/6/132682883/zomepipozufi.pdf
    • http://files.socaljea.org/uploads/1/3/0/7/130775431/fuwoxod-nenep-wusinarunat.pdf
    • http://files.centerstudiovt.com/uploads/1/3/1/4/131437792/991047.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60868594071.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/bexagoruzakemen.pdf
    • https://cdn.shopify.com/s/files/1/0445/3951/0948/files/14452080828.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/busunomusalitinikixesolo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/wuriligemogonanagipu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/kuxuzotagozupepetigawodud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8969/0773/files/postgresql_pg_hba_conf.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/mazagolesekolaluzovove.pdf
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/blackpink_kyocera_dome_concert.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/54394889559.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/transformers_flywheels_toy.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/caligula_camus.pdf
    • https://cdn.shopify.com/s/files/1/0429/4174/3263/files/48817324527.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_off000069c9.bin
1d392718caf449eb73c7ef07aa52d50dd7c57dfa0df40b3484579de0b84b6300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 5272 bytes
font_01_sfnt_off00007bbe.bin
f893f27968f17d113274000d9d7b8cc9c57c815381b492b2953a512a9a4f2916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBE 10472 bytes

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