Malicious PDF — malware analysis report

Static analysis result for SHA-256 2232d1ecc2c51123…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 15:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 218ba55412f0aad96febaeb9b767ae5d SHA-1: f209d8bbb3fb978c73dbd93730c648b947c4b02c SHA-256: 2232d1ecc2c51123e11c7faa5d92f0585808451b1d3c62643236ace70695c228
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.ru, which is disguised as a free algebra calculator. This redirector likely leads to further malicious content or exploits. The document body, though heavily obfuscated, contains the same lure text and URLs, reinforcing the malicious intent. The ML classifier also strongly indicated maliciousness.

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=step+by+step+algebra+calculator+free
    • https://static.usrfiles.com/ugd/353d00_0afa610d39284977815666851cdd0ef6.pdf
    • https://static.usrfiles.com/ugd/9e41f0_7a4839472a0f40cf867b6f4cd465ca10.pdf
    • https://static.usrfiles.com/ugd/b8c837_890edbcfbb974a88b5e690fcd385f8fe.pdf
    • https://static.usrfiles.com/ugd/d2751c_1562de1d6d1c4876a85726d002e59151.pdf
    • https://static.usrfiles.com/ugd/b8c837_f09ee20ddcb847f99ea77f51b776e095.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4137/files/bayesian_algorithm_in_data_mining.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5517/files/34929733680.pdf
    • https://static.usrfiles.com/ugd/b8c837_88e5ae1a84cb4ed89e333e06beae123e.pdf
    • https://static.usrfiles.com/ugd/83b1b3_c6ad6dab3fdf4ea2824063c6783bb947.pdf
    • https://static.usrfiles.com/ugd/fedf23_ef13cff08f1d40fe92dadcca86acca98.pdf
    • https://static.usrfiles.com/ugd/cac9e4_2acd5788ef48407ca15ada891de766d3.pdf
    • https://static.usrfiles.com/ugd/5e8de6_0d27b553725e45bc973da455a6448cfe.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_off00008d12.bin
a97aec5ad943e12f1a532e97f80c8da67c004a84c79c7c1d32b27489a613628d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D12 5528 bytes
font_01_sfnt_off00009ff6.bin
196a01643bb4343c5bd0797645fcbb2f0dbaab48ad8b6983d6713c7b6f8a4db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF6 10120 bytes

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