Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3353a89749d47dd…

MALICIOUS

PDF

42.0 KB Created: 2020-08-11 08:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4ae5d7cf87de89d7333fd3b58e93638 SHA-1: f6a6150d2d31abf345d63097e438d5104ffe5d69 SHA-256: d3353a89749d47ddcbfdbb7c100d3b8d4d4d074f4b8cba660b9a7df60702c631
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'free download crossword puzzles with answers pdf' and the malicious URL itself, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting a malicious intent to redirect users. No scripts were extracted from this sample.

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.ru/pify?keyword=free+download+crossword+puzzles+with+answers+pdf
    • http://files.fijifreshkava.com/uploads/1/3/2/8/132816066/62df9b0ea6045ff.pdf
    • http://files.funom.org/uploads/1/3/1/3/131384098/kovetoganikujav.pdf
    • http://wasij.rachelpevsner.com/uploads/1/3/1/4/131437987/minizowel_tajabes_jomiges.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/virosifojet.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/legacy_garage_door_opener.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/28907098661.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/6620110928.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/95614058719.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/19927235899.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/54748671097.pdf
    • https://cdn.shopify.com/s/files/1/0437/2725/7749/files/somopuwazulisa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/campus_cruiser_dtc.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/zupove.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8437/files/57344051484.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_off0000651c.bin
b84e8d6e7da3e30014e3ff152ba576bff77080ee2c5e663fde53f3b5af7957ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 5340 bytes
font_01_sfnt_off0000775b.bin
b0e6152741aeef05adbc51266607d7d7a0fc64202af5a895c5859a36423fb91b
pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 10468 bytes