Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e258c5926bfbce…

MALICIOUS

PDF

37.7 KB Created: 2020-09-09 19:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce3b3161eca22e917038897df0d52c5 SHA-1: 82e8a42574253e9b215aa8288dbd8a8801288820 SHA-256: e2e258c5926bfbce041e35c0d808474065c1fb4067d5273b71a68d226f5fdf0a
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 a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the same keywords and URLs found in the heuristics, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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.club/pify?keyword=bhimrao+ambedkar+song++mp4
    • http://files.wargamemodelsinohio.com/uploads/1/3/1/3/131397971/lojigenijisifo_majejonoji_bojoxi.pdf
    • http://vikudelir.pilatesante.com/uploads/1/3/1/3/131383544/6483733.pdf
    • http://jogemexal.phillytypewriter.com/uploads/1/3/0/7/130739695/xisefinilu.pdf
    • https://static.usrfiles.com/ugd/1d5a3f_3bff65d8f25645c3a22030ddd8244f71.pdf
    • https://static.usrfiles.com/ugd/800b88_c43503a4923a4fe6a3de305f66741da0.pdf
    • https://static.usrfiles.com/ugd/516793_326d0b2965f74d0db10f9b33407a5b3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_02bb9f10155e4e8e9999a1a9cbf81de1.pdf
    • https://static.usrfiles.com/ugd/760101_b388afd52caf40de9f09ed2dfa7eb51e.pdf
    • https://cdn.shopify.com/s/files/1/0440/5441/3462/files/casbah_menu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3058/4213/files/southern_africa_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6576/9110/files/93301721012.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0630/files/anand_telugu_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/9356098741.pdf
    • https://static.usrfiles.com/ugd/234f58_0039d89981de4454a4733af395cd4aa8.pdf
    • https://static.usrfiles.com/ugd/ae059d_9ec8dd90395147e8ad701e2c04608361.pdf
    • https://static.usrfiles.com/ugd/739437_b13ef3ff13a5426b977e47b42d541154.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_off00004884.bin
28aa1570f07cf77a400ca4e2c70da1162607e7479652a6e39ee318c7db387d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4884 5392 bytes
font_01_sfnt_off00005a9d.bin
7c4337a7f4af0146ffb7ea5805666084b3d865f9025b71d4b9fb19900cd988b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 9656 bytes
font_02_sfnt_off00007bb2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB2 4324 bytes

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