Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbe66d9f05da476…

MALICIOUS

PDF

35.0 KB Created: 2020-08-21 17:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09c37b7413cfb86999a59b48f71b74c5 SHA-1: 6313c15738a78bab973c9751effcc17002e31b3c SHA-256: 8bbe66d9f05da4767d6a945be371161b615cabd0d51177f4596678951fd678d9
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to external PDF files. One of the primary links, 'https://ttraff.ru/pify?keyword=pocket+guide+to+hydric+soil+field+indicators', is identified as a malicious redirector. The document body, though partially corrupted, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or redirection strategy to distribute malicious content.

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=pocket+guide+to+hydric+soil+field+indicators
    • http://files.mymollydoll.com/uploads/1/3/0/7/130775309/dosumadu_dijukazasuko_mubezanizi_lutog.pdf
    • http://files.jeniballdesigns.co.uk/uploads/1/3/1/4/131437799/zolafakeb.pdf
    • http://xugazom.partmason.com/uploads/1/3/1/1/131164250/6047223.pdf
    • https://cdn.shopify.com/s/files/1/0439/4467/3448/files/bsc_agri_online_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43181801848.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/comment_apprendre_a_lire_l_arabe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/74441147612.pdf
    • https://cdn.shopify.com/s/files/1/0429/6353/3977/files/biblical_duties_of_a_pastor_wife.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/24405117831.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/basaxovovowokuguxezunane.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/wuxujovibilasinaxufirib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/nuwizatura.pdf
    • https://cdn.shopify.com/s/files/1/0430/4171/8426/files/advanced_excel_formula_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/gasixawos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/java_gui_example.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_off000048ff.bin
f8907e3a1bc87a3a00513970fafad7aaac1b1f0f677be5432e724340e978445d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48FF 5448 bytes
font_01_sfnt_off00005b83.bin
cd2e3996043537fb7a2aca7e1a25ce21f4fad7f9c81432fe432f5d93d38b3e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B83 10332 bytes

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