Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb50ce93547455e…

MALICIOUS

PDF

45.5 KB Created: 2020-08-18 22:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 243f1719403db1eadfe78dde98f45c18 SHA-1: e150c131bb5a84cbbe48b4aae9f1d7aa063df479 SHA-256: 4eb50ce93547455e0153f7129ba6f9b3e5f592879750128c48e722a5f841d9f8
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to other PDF documents. The primary malicious URL, 'https://ttraff.com/pify?keyword=english+speaking+countries+test+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of the malicious URL and the link farm structure suggest an attempt to distribute or redirect to malicious content, potentially for SEO manipulation or malware delivery.

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/pify?keyword=english+speaking+countries+test+pdf
    • http://fenowepe.frigatebirdfishing.com/uploads/1/3/0/8/130814106/mukupeked.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/les_accords_de_camp_david.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/binary_logic_and_boolean_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/20727394208.pdf
    • https://cdn.shopify.com/s/files/1/0449/0277/6999/files/agrahara_insurance_claim_application_form_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/ayushman_yojana_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/xewas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/dakimepaselunanilunabexer.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5682/files/8922099054.pdf
    • https://cdn.shopify.com/s/files/1/0447/3815/0549/files/star_wars_aftermath_empire_s_end.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2045/files/joana_s_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5604/4959/files/getumagowepuvuxozorekev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000538f.bin
f4ee5a2b893c4b2b459e78edab0e3f92be0ddfcc784fcfc0ee55b11acba3c5e0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x538F 5128 bytes
font_01_sfnt_off00006554.bin
1222f117e349d619eba21a2c00dc490d3a1971effdb6d0de786774cd4812130e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 5320 bytes
font_02_sfnt_off0000775a.bin
a509ba618f0d9ef1702a38442e6aba196f2a56299a338b3bdcc30d33dcf1c845		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775A 10000 bytes
font_03_sfnt_off000098f4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F4 4324 bytes

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