Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b68760234228f2…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 09:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e13b68ab1140674cc9a0bfe73a67b644 SHA-1: 2e1e72857839cd44bc7f5a7b7cac9e08ec4aba43 SHA-256: c1b68760234228f252916f71ca96c061415927947c7ee65f4546a0a20071172f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a generator manual. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=generac+3300+generator+manual
    • https://static.usrfiles.com/ugd/b8c837_f8472c99018f48b3b8afc86dcfd9bbd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_175f96dd976f40d58580415c47c74b16.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b16d1d4224f41dd92eab41919879f9f.pdf
    • https://static.usrfiles.com/ugd/d17951_d90ab137ff824ba59991c4047ae24dd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_895bc1339dad4deebd748217b346c316.pdf
    • https://static.usrfiles.com/ugd/6cfc61_6028cb53452a4f1f9fb466af8838bd33.pdf
    • https://static.usrfiles.com/ugd/1849a1_797efb9b3e5c4e229d386762e8bc8553.pdf
    • https://static.usrfiles.com/ugd/4d935e_592e6f935c90463295a0d690a4245ad4.pdf
    • https://cdn.shopify.com/s/files/1/0465/3980/0734/files/63849078600.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/test_train_split.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/xalixanidore.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/97038758629.pdf
    • https://cdn.shopify.com/s/files/1/0440/1473/1414/files/applied_mathematics_123_key_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/manual_de_botanica_geral.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9157/files/sibajevabadejomigonefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/6898948300.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000570a.bin
da6e683b0878d5b5c4d5559d8fd3aab651dcf1d2383ea60e528a7c03acd526d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570A 5280 bytes
font_01_sfnt_off000068ee.bin
982eecb3497b37fd28c12b90c7a0adedaf5ec8e9f76c62eb816fcbb03a666064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EE 11340 bytes
font_02_sfnt_off00008e27.bin
1c1143839f05a5789524e75987812d4076a19e8c6e3280f717ab7b4921f49ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E27 16172 bytes

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