Malicious PDF — malware analysis report

Static analysis result for SHA-256 a479866f4b156ccf…

MALICIOUS

PDF

40.7 KB Created: 2020-08-09 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c7f0babf07087d3f83fe721bfb3f51 SHA-1: 4845d72405a4fa2e0bb7016c60ee92661dd7ae7c SHA-256: a479866f4b156ccf7ced87823fb98fde1151a269f4ecb3a755887f362d8065dc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body text is obfuscated and contains a URL that appears to be part of the redirection chain. The presence of numerous links, including one pointing to a known malicious redirector, strongly suggests a phishing or malware distribution attempt.

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=am%25C3%25A9lioration+continue+kaizen+pdf
    • http://doled.eatdancebreathe.com/uploads/1/3/1/0/131070420/mojugir.pdf
    • http://files.glamorouspeachboutique.com/uploads/1/3/1/4/131407148/rebufotiwizi-xamobenox-bupudamevame.pdf
    • http://files.chasehillschool.com/uploads/1/3/1/4/131454102/8d8a957c201718.pdf
    • http://files.sweetteasweettreats.com/uploads/1/3/1/4/131408245/3283174.pdf
    • https://cdn.shopify.com/s/files/1/0437/4046/3255/files/50341532305.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3571/files/sevosaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4555/1271/files/24719193157.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/50605010046.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/xejudaguzezuwum.pdf
    • https://cdn.shopify.com/s/files/1/0429/2299/9964/files/adrenergic_drugs_medicinal_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/los_arcturianos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/fenugilok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/25488422345.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_off00005e94.bin
67d9fd1f5ca6873a0dcaf9108c766c942f85dcf2869460a77e07cc511c32972b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E94 5368 bytes
font_01_sfnt_off00007086.bin
b22f5dadf39210aaa410d8aa1cd6af1a3ec2efedb27d951594277429ac10c969
pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 11348 bytes