Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88960dd8b8011f…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ce4ee8af9202dfa92c64a171c44bdc SHA-1: 723d868075209ec8c765fd5576c80fe3aaa18d93 SHA-256: 3b88960dd8b8011f46e96d64175a928decbab70d9c797dc798d8cb98b47823b6
152 Risk Score

Malware Insights

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

The PDF document contains a prominent link to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting a lure related to 'root file manager for android'. The presence of numerous external links, many pointing to Shopify domains, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the ultimate destination. The ML classifier strongly supports the malicious nature of this PDF.

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=root+file+manager+for+android
    • http://files.faithlutheranmonmouth.org/uploads/1/3/1/1/131163601/a63d8d2139ff50.pdf
    • http://files.outsiderartbyunclenorman.com/uploads/1/3/1/3/131380953/9546787.pdf
    • http://files.heartlandchurchnetwork.org/uploads/1/3/2/8/132814387/a72f5b06681.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/tapop.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/wawiburevowegiluwozefejo.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/category_management_in_purchasing_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/ginukebadaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9741/files/iirc_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/chordate_zoology.pdf
    • https://cdn.shopify.com/s/files/1/0430/7353/6161/files/47701965228.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/11478101903.pdf
    • https://cdn.shopify.com/s/files/1/0439/4365/7627/files/98534032534.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/we_came_with_broken_teeth.pdf
    • https://cdn.shopify.com/s/files/1/0435/4372/4186/files/biriwimiter.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/who_is_chris_pine_s_grandmother.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/gipudozugumowazog.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_off00006258.bin
767dab8c857824d4b9e0566849bc5b1557386c13ff48f7269bb45e515de98b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6258 5056 bytes
font_01_sfnt_off00007370.bin
a7f69141f5a6c5c22815ceeac7d470dadded69a73f7e00e764bb3c2ed165d454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 9868 bytes

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