Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9187865f76dc0a…

MALICIOUS

PDF

53.7 KB Created: 2020-08-31 08:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24da2e6ed8464923956d82dea159c4f SHA-1: d0edf6f3ba5b3d17284060b6723d94d42959035e SHA-256: 0e9187865f76dc0acd9ed5913c47954e6905286c964b94144a381837e8611412
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://ttraff.ru/wix?keyword=ejercicios+maximos+y+minimos', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, 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.ru/wix?keyword=ejercicios+maximos+y+minimos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/01bc73_b7c091f4a741466daff63ffdfe23abbc.pdf
    • https://static.usrfiles.com/ugd/345929_1f65170b76c5492cb109fd72305a9140.pdf
    • https://static.usrfiles.com/ugd/b8c837_4dbfd1bb29f6442f87913fea45ad7d39.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/fopet.pdf
    • https://cdn.shopify.com/s/files/1/0427/9851/4343/files/susodop.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7525/files/42307351046.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1496/files/mathworksheetsland_permutations_and_combinations_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/kenmore_sewing_machine_parts.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/37748068152.pdf
    • https://cdn.shopify.com/s/files/1/0446/4377/8723/files/metoxitazaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/kosoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/genejolutarurupoluvume.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/realtek_pcie_gbe_family_controller_advanced_settings.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/30192813996.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/neoclassical_economics.pdf
    • https://cdn.shopify.com/s/files/1/0450/2283/8934/files/mumadowaweriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/guzogixopuzaromolew.pdf
    • https://cdn.shopify.com/s/files/1/0437/7667/1895/files/30719310962.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007374.bin
e515c2ae52a9f01df7e32a7688f3079a8127f7f55feb78ac88f9a00e8b2629d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 5116 bytes
font_01_sfnt_off000084d2.bin
30235374b4e3d35c8858747f008f46fb82528058fcb58b3366ba634c7d3a0fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 14572 bytes
font_02_sfnt_off0000b1b0.bin
c3d0ee408bee49a88931d2ac630a9fb52e88a46fabab5a72aa19e78bbe1d3826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 16376 bytes

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