Malicious PDF — malware analysis report

Static analysis result for SHA-256 5892f7af4b60d2d3…

MALICIOUS

PDF

48.6 KB Created: 2020-09-01 01:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d09928bfac1e533540c9de5d77051b SHA-1: 79490a55ff3cbc42d452804ea795bada9a10da0d SHA-256: 5892f7af4b60d2d3b8be2b34c5d578d357992baebf7b8bf6a3f43ec952e0f0d1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, with a query parameter suggesting a lure for an 'attendance sheet template'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the phishing pretext. The presence of numerous links to external PDFs, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility.

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/wix?keyword=attendance+sheet+template+google+sheets
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/asme_b31_8_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/34469643323.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/no_man_s_sky_coprite.pdf
    • https://static.usrfiles.com/ugd/2e16aa_01f7c7f5bfec43f691893253f5903091.pdf
    • https://static.usrfiles.com/ugd/a59130_bcfa6e5572114ae99347cdbbc67f8374.pdf
    • https://static.usrfiles.com/ugd/10b11f_6e7f005362bf4ef09c9649edc0de5ee5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c800a2d639294caeb60323729bd83782.pdf
    • https://static.usrfiles.com/ugd/111c46_8712a538884b48849d91e0cebc4e2970.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ccf2d56d33244f8bd75b522285f7203.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1ed2993df2487d960fe704b1703569.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9280/files/css_rounded_corners.pdf
    • https://cdn.shopify.com/s/files/1/0433/1703/5166/files/case_in_point_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/absceso_hepatico_en_pediatria_revision.pdf
    • https://cdn.shopify.com/s/files/1/0437/7991/5937/files/gebometowulejakez.pdf
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/free_way_space_adalah.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071be.bin
1b8a39826f9b32374b78ab19a2593347b5fbe6d52b4c2c923dcd8f0e309a2d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 5120 bytes
font_01_sfnt_off00008302.bin
98b7ef41c21652eda3b18fc7b87777a1297139041c60bf2d91e01afdc51a0425		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8302 10688 bytes
font_02_sfnt_off0000a6ca.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6CA 4324 bytes

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