Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab75a880cc40012…

MALICIOUS

PDF

34.0 KB Created: 2020-08-17 07:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f11d62db74af889f464e75068e03cde5 SHA-1: 419e3936243ccd634a9f4bf0c117b6ac08bd6aef SHA-256: 4ab75a880cc400121e3ae641554c63f528251925d3f285ce1e28cfcf59a26eb2
152 Risk Score

Malware Insights

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

The PDF document contains a deceptive lure, presenting itself as a Chevrolet Traverse manual, but its primary function is to host a large number of external links. One critical heuristic firing indicates that the document links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=chevrolet+traverse+2014+manual. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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/pify?keyword=chevrolet+traverse+2014+manual
    • http://files.brave458.com/uploads/1/3/0/7/130775163/filogozotax.pdf
    • http://ratijibol.jolenewright.com/uploads/1/3/1/3/131384169/3991615.pdf
    • http://files.overcomeporn.org/uploads/1/3/1/6/131637362/7606694.pdf
    • http://pepisuzu.mriserhoff.com/uploads/1/3/1/1/131164250/4431275.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/lafiwowovapisumuxawet.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/hey_baby_mp4_video_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9710/4288/files/81160815734.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/rusedunekuvasin.pdf
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/45949904089.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/oxford_dictionary_of_sociology_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/12224330922.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/52331381086.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/beamer_latex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/bixopivuroxol.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/jevekefajevuxopak.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/varapetivojugorubirubir.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_off000048d9.bin
3928412c183d8371f4eef4d05aed9d22e5b0e983e4e9342cdcebf5929f880d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D9 5304 bytes
font_01_sfnt_off00005ac0.bin
6569ffd142eae9679cd14dfc35dea894b129e6ae4f6dd402693a24a8ea490b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 9596 bytes

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