Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbfa91d868c1c15…

MALICIOUS

PDF

38.1 KB Created: 2020-08-12 18:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30769c6514e3a8ff7da770b276019a56 SHA-1: e7f7dcc6f6b439356b24420c480209374f8735f5 SHA-256: 4fbfa91d868c1c15233859e236681e6f5c9f719d9aba2f4288f65b5c1c9720da
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though corrupted, contains text related to the embedded URLs, suggesting a lure. The primary attack pattern involves redirecting users through a link farm, potentially to a malicious site or for SEO manipulation.

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/pify?keyword=cours+sur+les+bascules+electronique+pdf
    • http://letakas.monkeesconcerts.com/uploads/1/3/1/4/131407995/fixifezu.pdf
    • http://files.skylarkpubl.com/uploads/1/3/1/8/131871907/lewofikiwi_pefivoro_pawifebimijomet.pdf
    • http://janejapiv.waggabeekeepers.com/uploads/1/3/2/6/132681066/b3b9a21.pdf
    • http://files.uamiztontli.com/uploads/1/3/1/3/131383456/zetegumo-novakowoperuru.pdf
    • http://files.parakeetpro.com/uploads/1/3/0/7/130775868/6672936.pdf
    • https://cdn.shopify.com/s/files/1/0448/4897/1938/files/ascending_tracts_of_spinal_cord.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/gigojadudosomilomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/59388095392.pdf
    • https://cdn.shopify.com/s/files/1/0434/5793/7561/files/essentials_of_corporate_finance_9e.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/57353891715.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/saburaxuwokegude.pdf
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/16604371107.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/the_fremennik_trials.pdf
    • https://cdn.shopify.com/s/files/1/0437/6150/0309/files/wonaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/6868500547.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/accuweather_fresno_hourly.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_off000048c4.bin
8db2bcab6ee20ce0c0b9127ea439c47a91fb79e3a1d8801367edbc3f232768ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C4 5320 bytes
font_01_sfnt_off00005ade.bin
4521a4fcf10fac21f0bf8d934e3e02afd80b568e6043c8378c2b6c8641e25c62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADE 9940 bytes
font_02_sfnt_off00007b40.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B40 4324 bytes

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