Malicious PDF — malware analysis report

Static analysis result for SHA-256 49caefa041a3e883…

MALICIOUS

PDF

70.3 KB Created: 2020-08-06 10:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa83ff4d39f4a8f16118c8d7243f4901 SHA-1: d8bcd77ce61a153addad2f32cc17c2a8ac1c3e93 SHA-256: 49caefa041a3e883eac6b586db659b935f741b57f785753025e7644e727132d7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is also flagged as malicious. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=barycentre+logistique+pdf
    • http://files.myangeliques.com/uploads/1/3/2/6/132682048/zezosafidip.pdf
    • http://files.thomphelps.com/uploads/1/3/1/3/131384573/fbc638878f64e.pdf
    • http://files.ewiechart.com/uploads/1/3/2/3/132302913/gomokiwu-dapewijutufose-jofumuvusu.pdf
    • http://files.crookeddoorstudio.net/uploads/1/3/1/3/131379591/b5173181.pdf
    • https://cdn.shopify.com/s/files/1/0433/7175/7718/files/2152080937.pdf
    • https://cdn.shopify.com/s/files/1/0430/5243/3557/files/lesefebimusadiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/pujejemojazawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/56409911402.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/denuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2777/files/97380599476.pdf
    • https://cdn.shopify.com/s/files/1/0431/0027/4845/files/86929313783.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/46269947490.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/98881566528.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/accounting_for_financial_instruments_cormac_butler.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/katigofawinujeba.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
font_00_sfnt_off0000a0cd.bin
a406a9c9a560cacab3f61d5f233bb51a320f9eff80f513a3f8a3950a9d5c5c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CD 5484 bytes
font_01_sfnt_off0000b37f.bin
921425c9d19a16e575c9a3399a257ce2c00a21f686fb10e951041c15ae0c754f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 17660 bytes
font_02_sfnt_off0000e6ef.bin
c86dd2e8eb9073f5525c3b0ae269a7213f91b44edbf915aca2fe1d7e9d6d56b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 16144 bytes
font_03_sfnt_off0000fbe9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 4324 bytes

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