Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e75456b199bfcd4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 03:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c3936720dacbea73984ab4c78b525cd SHA-1: 6758f3df35b8026cfc9c08b07814c75010872189 SHA-256: 9e75456b199bfcd455b4f473852960cb24f73d9f7c93edd249d114e28e2e98ba
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Stamford alternator wiring diagram pdf' and includes the malicious URL, suggesting a lure to disguise malicious activity. The presence of a link farm further indicates an attempt to obscure the true destination or distribute malicious content.

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=stamford+alternator+wiring+diagram+pdf
    • http://files.napervillebigbandjazzfestival.com/uploads/1/3/1/3/131381677/155788.pdf
    • http://files.civilwarlady.net/uploads/1/3/1/6/131607522/firefezadomi.pdf
    • http://files.catiegarzaphotography.com/uploads/1/3/1/4/131437158/guwovodix_gugik_mujaven_dafijib.pdf
    • http://files.magicmudceramics.com/uploads/1/3/0/7/130740462/c3a76e7c0d8.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/self_directed_ira_llc_operating_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/71588590439.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/53718305837.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/85298464606.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/83427639964.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/pabokezonaxubomedidekos.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9295/files/the_alchemist_summary_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/fopinunogeruboxiror.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/67990148005.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/67713814735.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/jobejugogubu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4359/files/start_with_the_end_in_mind.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/anti_bouncing_check_law.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_off000065c4.bin
54d6153d7be32694135c9523adb8c82f5bf1e5399231fae6c793cb18a41827a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5376 bytes
font_01_sfnt_off0000780b.bin
4c8bba49215565e5a188c759042140e76ac5ffd14a9d67c73c7c96b382c1fc56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x780B 11628 bytes

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