Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0aeb3883fe14312…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 04:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57b439b7b3aa50cd07e07b05126b5cf SHA-1: 3e09bb1a23831d488fd49f3e55cfcfc4affa228e SHA-256: a0aeb3883fe14312093526609e490fd3af93b78305498be306d8de939eda12fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is https://ttraff.com/pify?keyword=non+verbal+reasoning+practice+questions+pdf. While no scripts were extracted, the presence of a malicious redirector and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

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=non+verbal+reasoning+practice+questions+pdf
    • http://files.chicocyclingteam.org/uploads/1/3/1/4/131453718/fezoxeb-ramalodov.pdf
    • http://files.drkesconcrete.com/uploads/1/3/2/3/132303068/xivapexur-benuxojoxaw-pezesavuruza-zodonozaxu.pdf
    • http://files.atlantamedicalaesthetics.com/uploads/1/3/1/1/131163898/8177963.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/61203212271.pdf
    • https://cdn.shopify.com/s/files/1/0430/5023/8101/files/546600061.pdf
    • https://cdn.shopify.com/s/files/1/0431/4900/0864/files/atomic_habits_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/bopavoru.pdf
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/carrier_reefer_unit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/onan_generator_5500.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/92686189516.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5276/files/bourre_in_e_minor_guitar_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/64848907747.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/65877342336.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/6003/files/alfonsina_storni_el_dulce_dao.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9942/files/merenexup.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/diniwizuzijotedesivu.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_off000067cc.bin
0a2193662948e8e09869dd4bae797092ca11b62dd178dea07cce7f49965fdbce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CC 5500 bytes
font_01_sfnt_off00007a83.bin
cf6c02b90f6e705aa33ff64b9d32824c837f92cee189a8cf9ccaed281f37321f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 10764 bytes
font_02_sfnt_off00009f05.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F05 4324 bytes

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