Malicious PDF — malware analysis report

Static analysis result for SHA-256 565a4f8c8cc44ccf…

MALICIOUS

PDF

55.2 KB Created: 2020-08-05 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f61987bdb3cbb96c7500ee6287e2ef9b SHA-1: a54d80e9cbe653f266db513fc7e902da5f39f21c SHA-256: 565a4f8c8cc44ccfa9b1559545b4049c5c3561f134608257458df12605568793
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with one pointing to a known malicious redirector, suggesting a phishing or SEO spamming attack. No scripts were extracted, limiting the analysis of direct payload delivery.

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=cours+d+espagnol+d%25C3%25A9butant+gratuit+pdf
    • http://files.sweetavenuephotographyblog.com/uploads/1/3/1/8/131856112/5936769.pdf
    • http://files.stuclements.com/uploads/1/3/1/3/131379844/bepul-momukitaxupor-mowidegez.pdf
    • http://files.columbianow.org/uploads/1/3/1/4/131438405/dojinoserowe_gajokax_fitamivagumed_botejodevabiras.pdf
    • http://files.loveadelyn.com/uploads/1/3/1/3/131384604/1988225.pdf
    • http://bizurireb.jaymcclellan.com/uploads/1/3/2/7/132712358/xilowigupifuvodonep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/zorurezokerofowidoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3059/files/catholic_university_of_malawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/wozidijaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/dotokevadawasug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/10612663752.pdf
    • https://cdn.shopify.com/s/files/1/0428/1185/0918/files/48041075079.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/donin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/naloduvamewakerulatimif.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/mabolinitus.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/pezovetebewuzugavufafe.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/40200738618.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/razuf.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_off0000805d.bin
34e46b77ac85fc1762ff788fd67d059565d5f1988a26c524791dbb8c12a5b31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805D 5396 bytes
font_01_sfnt_off0000926d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x926D 1800 bytes
font_02_sfnt_off00009afa.bin
660a44292e50faebe78058d18c72df53f7cc57209b5fcbf090a3319b8ad8a68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFA 17256 bytes

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