Malicious PDF — malware analysis report

Static analysis result for SHA-256 650174b30725d13e…

MALICIOUS

PDF

59.3 KB Created: 2020-08-31 12:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe04c0d39f24a8095eb9cc7794d6daaf SHA-1: 5df8c27286ae4499fc001f2351af256ed0ddb335 SHA-256: 650174b30725d13e03066261118c6001c36d2e44dbe94b16ef7e9eb6b765a37a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to a known malicious redirector, ttraff.cc, with a keyword suggesting a lure related to 'Samsung PC Kies'. The document body, though heavily obfuscated, contains this URL and a large number of other URLs, many pointing to Shopify, which is indicative of a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector and the link farm suggests an attempt to drive traffic to malicious sites, likely for phishing or scam purposes.

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/wix?keyword=samsung+pc+kies
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5719/8742/files/endodontic_files.pdf
    • https://cdn.shopify.com/s/files/1/0438/6262/2358/files/complementary_filter.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/china_study_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/59931851133.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/administrator_duties_and_responsibilities_list.pdf
    • https://static.usrfiles.com/ugd/b8c837_62739d95b2f248fca9c21bdb07cb5f2f.pdf
    • https://static.usrfiles.com/ugd/aef5b7_50210d3e671e46e290e47ac343cd8478.pdf
    • https://static.usrfiles.com/ugd/dad90e_7ad93c67cbea45e8bd4a367c63485a7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8801ef0e5bec44738a311b88c4222d24.pdf
    • https://static.usrfiles.com/ugd/07e02c_84d97e5709d1428eb736fd29a7d246e9.pdf
    • https://static.usrfiles.com/ugd/ade4e6_528d49d429dd49e0bc89930b89ead700.pdf
    • https://static.usrfiles.com/ugd/affaa6_26685e5a6ca042b084334baee759e995.pdf
    • https://static.usrfiles.com/ugd/4bb894_34fdac5d295e4fa4aa1a683a4a8dbc08.pdf
    • https://static.usrfiles.com/ugd/b8c837_58920cc15e0a48b4b9f9f191845df1f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b979ce8607ed40329994dec60aaaf686.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/linux_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/96917372262.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e8e.bin
5f8b4d62a9d444ba121cdb0adbce3163b45f3c6be5c21ee4853e2766be6cb5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8E 8048 bytes
font_01_sfnt_off0000a9bf.bin
973c64ba616970b6e2ac638ecc0fc8c0b7b43ab1287abc00e79f8c208adc3820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BF 5292 bytes
font_02_sfnt_off0000bbae.bin
bc8c5dd2a2f4368113c72b8ae78ae901e5bfe64b7fb975adc59446216c8fa8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAE 10832 bytes

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