Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e3e69b049ba26a…

MALICIOUS

PDF

55.6 KB Created: 2020-09-01 11:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b930ad586b8c816e360052980a5f949 SHA-1: a15eaf13eb4f4fffd15a7d8aae99b0118c79442d SHA-256: 13e3e69b049ba26a177e6a19b98b1e1632b05d90da76af308c1ddada84a2deee
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The presence of a 'download button' lure further supports a phishing or redirection attempt. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acrobat+pdf+converter+to+word+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/all_phylum_of_kingdom_animalia.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/jivak.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/bidikojonokazodetidugeje.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/woodworking_workbench_plans.pdf
    • https://static.usrfiles.com/ugd/865d50_1fddb8617dd14eb986893e019d44a6be.pdf
    • https://static.usrfiles.com/ugd/c12414_48d17cdaf18b4dc89437fb0137bcb224.pdf
    • https://static.usrfiles.com/ugd/b8c837_64c7c4ebf16c4487970e57a9a99e91ba.pdf
    • https://static.usrfiles.com/ugd/76156b_a99ce9ba82c94080a66300082e3d9ebd.pdf
    • https://static.usrfiles.com/ugd/fd30ac_f65dad5ecc964f6faa2cca4c64b2a35a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3313/2184/files/69975246198.pdf
    • https://cdn.shopify.com/s/files/1/0462/6946/4727/files/restricted_area_authorized_personnel_only_sign.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/xujojaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/33903145118.pdf
    • https://cdn.shopify.com/s/files/1/0429/6933/3916/files/aptitude_test_for_computer_science_engineering_students.pdf
    • https://cdn.shopify.com/s/files/1/0458/6438/6713/files/rizusigokano.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5003/files/14978905302.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8889/files/17814537330.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006515.bin
70f77588d0ca95a71692610b8a029baf5c51ddbe02e2358a30f7a69b165e9eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6515 12904 bytes
font_01_sfnt_off00008cb6.bin
482f55aacf73c1a64d5590699736fe8756c7407a39af651c46d9a8f4645c03ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 4960 bytes
font_02_sfnt_off00009da5.bin
292e9a25df94be6c83155babe01e4ce51641b35f58fc83d799b038fdc195f26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA5 10228 bytes
font_03_sfnt_off0000c065.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC065 4324 bytes

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