Malicious PDF — malware analysis report

Static analysis result for SHA-256 94890a40a7b494e7…

MALICIOUS

PDF

44.5 KB Created: 2020-08-09 09:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c960faa198c629f8653f4195b26bfd90 SHA-1: e0a7709549819d566d0d8a5059f5251a1fab6c98 SHA-256: 94890a40a7b494e78d2d7cd7ea8c7ca9257a014b37f935bc8ed43cb283b8d8f1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'College ecology textbook pdf' and a URL that appears to be a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely a user clicking the embedded malicious link, leading to further compromise.

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=college+ecology+textbook+pdf
    • http://files.fatdtogo.com/uploads/1/3/2/6/132681194/farijuberifep.pdf
    • http://files.starandmoon.org/uploads/1/3/0/9/130969048/d5da8.pdf
    • http://bijomo.handhwindowcleaning.com/uploads/1/3/0/8/130814535/bexijufafufon-pudupabilenif.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/nodamanerixedejigofun.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/lord_byron_love_poems.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/64483658410.pdf
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/banerisexivogokapiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/differentiator_op_amp.pdf
    • https://cdn.shopify.com/s/files/1/0435/4578/8584/files/madif.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3095/files/linear_system_theory_and_design_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/alice_miller_for_your_own_good.pdf
    • https://cdn.shopify.com/s/files/1/0432/2030/4034/files/luzodoludesesipefisufit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/51260315986.pdf
    • https://cdn.shopify.com/s/files/1/0433/8856/7706/files/filemerge_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/44111231728.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9854/files/kotapeguroze.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_off00007142.bin
c40a1864d983a58dca02522177228c822b7dec1386b25dd02ec42d101ddf952c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7142 5116 bytes
font_01_sfnt_off000082cf.bin
5842d0f2fcd0e1bc985e44b9ede793241a055f69725a2b9aaf1b6e704c822bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 9944 bytes

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