Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5195a5e3c0194e…

MALICIOUS

PDF

53.9 KB Created: 2020-08-06 21:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc365bb05f8186ed1c2c8ecc74cd540a SHA-1: 1b226dbdc56f98e29454391854e5ddc44333a99a SHA-256: 9a5195a5e3c0194e3d92f25c77de8ad5901a66f6042be6e6ab49275991f2e1be
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, a common tactic for SEO poisoning or redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=absceso+dentoalveolar+tratamiento+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=absceso+dentoalveolar+tratamiento+pdf
    • http://zokatokoj.affordablestoragebrownfield.com/uploads/1/3/1/4/131407469/d2fb0963fe222.pdf
    • http://files.landerbodyworks.com/uploads/1/3/1/4/131437380/5990280.pdf
    • http://files.alexanderjayweissman.com/uploads/1/3/1/0/131070151/buvekuwo_livaliwojikuv_foxuwosanebadid.pdf
    • http://zokatokoj.affordablestoragebrownfield.com/uploads/1/3/1/4/131407469/d2fb0963fe222
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sufegikar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/hernia_incisional_tecnica_quirurgica.pdf
    • https://cdn.shopify.com/s/files/1/0437/8486/3893/files/tahoe_q5i_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/24021510748.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1285/files/stepmania_ddr_song_packs.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/wodibema.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/tetegemafobujisiwax.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/96041730570.pdf
    • https://cdn.shopify.com/s/files/1/0435/2586/5636/files/rigamewarofekavazapudizo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/17_sdgs.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/alesis_nitro_manual.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_off0000900d.bin
0205c65e0368ebbcca79092d8c9f223d9577a9bf06512700601aa56644178e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x900D 5488 bytes
font_01_sfnt_off0000a2a8.bin
7b6f6c920aab51df97c25b966e5db39d25735a99276e5a62fba9710f1a398bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2A8 11712 bytes

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