Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6156a9ac4669e1…

MALICIOUS

PDF

51.8 KB Created: 2020-09-07 08:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208fc1a3cb5da8f23a563030164c366c SHA-1: d1ff0ea3a9ea9bfb950a883e204054b2d4140416 SHA-256: 4c6156a9ac4669e1c659b662f90c94c5047bd49cd0cdf1661a3b0f6e019f1d53
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Vanguard advisor alpha pdf'. The PDF also contains a large number of external links, as flagged by PDF_SEO_LINK_FARM, suggesting a link farm or spamming operation.

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.link/wix?keyword=vanguard+advisor+alpha+pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/peptic_ulcer_perforation.pdf
    • https://cdn.shopify.com/s/files/1/0465/3629/4558/files/cobit_5_pam_supplementary_guide.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/neet_2020_answer_key_aakash.pdf
    • https://cdn.shopify.com/s/files/1/0457/3734/5180/files/54537204474.pdf
    • https://cdn.shopify.com/s/files/1/0463/1707/6637/files/39058575594.pdf
    • https://static.usrfiles.com/ugd/717a42_66f0f8bb657148c9bfc234c876012732.pdf
    • https://static.usrfiles.com/ugd/02beb7_b1529f791a1f44cab9a0f4b2b7706caf.pdf
    • https://static.usrfiles.com/ugd/76156b_d11dc7733337441691ce1110f77ec2b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_07678323f78b4d569390d06684eff081.pdf
    • https://static.usrfiles.com/ugd/e8e253_262117ec7331440fa2d22ccbb319b7d7.pdf
    • https://cdn.shopify.com/s/files/1/0439/2543/8619/files/diremijalunojirivawasam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7404/files/90673324721.pdf
    • https://cdn.shopify.com/s/files/1/0436/0024/8995/files/norma_astm_e84.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/luwabanafu.pdf
    • https://cdn.shopify.com/s/files/1/0462/7244/6613/files/where_can_i_buy_cavatelli_pasta.pdf
    • https://cdn.shopify.com/s/files/1/0461/9501/5831/files/automotive_repair_software.pdf
    • https://cdn.shopify.com/s/files/1/0435/4008/6935/files/a_single_shard.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/kpmg_asc_842.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_off00008b6e.bin
0cddcf0c6d14a706570ea54d18cb531f54bfd2fe4340de4f7fb1a465d601d209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6E 5328 bytes
font_01_sfnt_off00009d94.bin
73645f2f7c26c7ee951d189185daff034a5e6e54193da0358fb2abbc624161a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D94 10820 bytes

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