Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b3cef69f38deea…

MALICIOUS

PDF

41.1 KB Created: 2020-08-12 07:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa5a834985f0ee140b82f59c37e2940 SHA-1: deb637f4061a73b0a442d84f0d50ef0feabadb2e SHA-256: d1b3cef69f38deeafba9faae6b7c226320d6103277ec55e57eb09acf6afa0c18
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that host PDF files. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an intent to trick users into clicking it under the guise of a formula download. No scripts were extracted from this sample.

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.com/pify?keyword=differentiation+and+integration+formula+pdf+download
    • http://siwesatip.totalbodyfitnessnj.com/uploads/1/3/0/8/130874163/jafesage.pdf
    • http://files.jessicahockett.com/uploads/1/3/1/3/131381799/ninup.pdf
    • http://files.ntxsportswear.com/uploads/1/3/1/4/131407802/23d2a4819e2e61.pdf
    • http://mubek.binhamvillagehall.co.uk/uploads/1/3/2/7/132710714/peferixoxiludij_tubakufadaka_posavosemodeso.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/4116428300.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9002/files/20136265233.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/siruwimifawutepisuwit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/6298126065.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/pathogenesis_of_viral_hemorrhagic_fever.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/always_changing_and_growing_up.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9894/files/xubuzowujoradogolotir.pdf
    • https://cdn.shopify.com/s/files/1/0430/3192/0794/files/about_schmidt_script.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/kopobitiwizoroludoli.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8903/files/13552510660.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/ferusizaxexodegulabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/9572547065.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.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_off00005eb3.bin
8483164eac66e2f642dda7c99658618ebf80fee501a5db77cd58435a514d6764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB3 5272 bytes
font_01_sfnt_off000070a6.bin
8d3b44a2e7e05da175a2d708c51bc1d84c62aa5cd7d2fa04fc81609bdf074a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A6 12012 bytes

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