Malicious PDF — malware analysis report

Static analysis result for SHA-256 41585490210f5e3d…

MALICIOUS

PDF

35.0 KB Created: 2020-08-13 23:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b39e9fa41a2e204b0a6950f493e54c4 SHA-1: 60675fdd8d0e6f5a5bb8ae8fd23074040feb69fe SHA-256: 41585490210f5e3d2fc998520cfcf0248b58b196bd79772e1b13a247bbd0770e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc). The document body, though partially obfuscated, contains the phrase 'C. i. d video episode' and the malicious URL, suggesting a lure to entice users to click on the embedded links. 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.cc/pify?keyword=c.+i.+d+video+episode
    • http://files.robin-shapiro.com/uploads/1/3/1/6/131636642/rukogovak.pdf
    • http://files.standwithme.org/uploads/1/3/0/9/130969427/moxadiwemeso.pdf
    • http://files.stephen-burgess.co.uk/uploads/1/3/1/6/131637797/ramuwuba.pdf
    • http://xexameda.hillsgolfacademyindonesia.com/uploads/1/3/1/4/131406947/rovomogogotawo_mixil_pirubagujopemad_ragifajadonuja.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/vipiwuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/34197097316.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/dabuxugaxuxepemum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/zokenudisil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/zoxodamafolurop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1582/files/71661630408.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/13917243190.pdf
    • https://cdn.shopify.com/s/files/1/0431/3805/6354/files/vexopojemusinasifetesigix.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/dmg_to_iso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67264452348.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/kulaxuxige.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.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_off00004e19.bin
74947faf9fe6a2070933e9a8709d981dedf4921bcde9bb06cf51a7ec539d3487
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E19 4612 bytes
font_01_sfnt_off00005de5.bin
64bd7e68454c8cac30539c5ce253435a7b3a6b2c6a73ca946339d184e63ed6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE5 9768 bytes