Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a367dfc57f4e75…

MALICIOUS

PDF

39.7 KB Created: 2020-08-24 15:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf447b2b9c0d2142695c4db59d270706 SHA-1: 1f1272ab8a610c17747cde360ebad86f7a46cb1f SHA-256: 89a367dfc57f4e7530fea848ca6e35b393644708465b799ffdd784d2174c9cea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL embedded in the document body. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link 'https://ttraff.com/pify?keyword=skillport+courses+answers' leads to known malicious infrastructure. The document body text, though partially obfuscated, contains keywords related to "skillport courses answers", suggesting a lure to trick users into clicking the malicious link.

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=skillport+courses+answers
    • http://files.audubonelementaryeagles.com/uploads/1/3/0/9/130969077/pilonarabenuji_jonumi_vigalap_fapiwejuvaper.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/fipinere.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/avant_browser_free_for_xp.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/57172380836.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/ganinafawisowudu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0894/2499/files/gorite.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/1869369806.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/digital_logic_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/13004133962.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/vivivulekatoxorerabiko.pdf
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/fenemukaveru.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0675/files/mv_command_in_linux.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6165/files/37168147847.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_off00005c90.bin
fd21240c0aca423901a5f0c0476b4e111b8b90c4f1df526c0570a421ba23bf2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C90 5188 bytes
font_01_sfnt_off00006e52.bin
7d79ca3f37edcf819c84cc15f282cdec5a54e445fc56cf92906a82d06e2bc054
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E52 10604 bytes