Malicious PDF — malware analysis report

Static analysis result for SHA-256 891625effa53507d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-13 05:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 214092cb7bd46b35ff1f0f268ced0ffd SHA-1: 9da734e5f75323fe3db2f0f1efdb1299b851524f SHA-256: 891625effa53507d2bb19416be921c17a4bc86bb97bc0b019e3c4625b63c8ab0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for phishing or malware distribution. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/wb?keyword=extreme%20adjectives%20worksheet, which is the primary indicator of malicious intent. The document body, though partially corrupted, contains text related to an 'Extreme adjectives worksheet' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=extreme%20adjectives%20worksheet
    • http://sojaj.reservoirptsa.org/uploads/1/3/1/4/131453870/fc3e96d52129.pdf
    • http://monum.comepc.org/uploads/1/3/2/6/132681504/pigarosidobe.pdf
    • http://zegekew.wildflowersoftexomachapter.com/uploads/1/3/0/8/130874218/tererisasufapozuv.pdf
    • http://wotukofo.seasparishlo.org/uploads/1/3/0/7/130775934/90e83.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/jepesaturukigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/jurotogirasedad.pdf
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/convert_to_word_doc_offline.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/89700233470.pdf
    • https://cdn.shopify.com/s/files/1/0434/2707/0104/files/gamipigopog.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1032/files/iphone_6s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/97357718159.pdf
    • https://cdn.shopify.com/s/files/1/0449/9079/1844/files/firewall_checkpoint_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/9768559865.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/woredipumibidagolakomoxas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/pamugagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/amalgam_vs_composite.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/dabix.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/pdf_annotator_4_download.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_off00005fba.bin
610f996173b87030529f22978889f659423d02def7aa6eef78b460d3707e6d1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 5464 bytes
font_01_sfnt_off00007245.bin
bc25f2296c7c30ff77eaa79f6ca70b9a0ab027cd7725cdcb5588d6b1400c739d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7245 10516 bytes

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