Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14c9ec73c864de6…

MALICIOUS

PDF

36.4 KB Created: 2020-08-21 20:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31148a2d8d6873dadec28aa815904921 SHA-1: 983309b85ed44ff37453067b4758fe8219c8b6b9 SHA-256: b14c9ec73c864de610cc97bcbe4e80026bee3f2cd811a4a01f1512eadb251757
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to drive traffic to malicious infrastructure. 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.com/pify?keyword=bodybuilder+photos++free
    • http://wirozifit.irishoriginsofcivilization.com/uploads/1/3/1/0/131070786/patoman_matuvozefojowo_luruvoboligor.pdf
    • http://fejuf.yellowstonegrizzlyproject.org/uploads/1/3/1/4/131438392/3213380.pdf
    • http://files.thecosmicbrain.net/uploads/1/3/1/4/131453022/bejapatilij.pdf
    • http://zufumamas.westsidear.org/uploads/1/3/0/7/130739415/3058787.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/basic_knowledge_of_ms_office.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/wafalofawaredor.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/48891044250.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/kadetewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/json_file_comment.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/voporepolaronovemozinovim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7574/files/anzac_biscuits_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/88482111152.pdf
    • https://cdn.shopify.com/s/files/1/0430/5341/6601/files/ecommerce_refund_policy_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/98016454997.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/sufitumawuvibix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3022/3775/files/bavubijojixikuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004602.bin
af3da3efde72eb806441b9f1c5a2edcb8f52f5e18e8a1292eb70e1e1cbfd85be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4602 4984 bytes
font_01_sfnt_off0000570d.bin
8790585514b2b84e8fbbe2edced46dbe372037e0869aa5e1631ca607ff5bc92c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570D 9304 bytes
font_02_sfnt_off000076d4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D4 4324 bytes

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