Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecfc0cfe1dbe981…

MALICIOUS

PDF

37.0 KB Created: 2020-08-05 08:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 317f2df376c1604eb89c088e453cc8d7 SHA-1: 84edc98d690ecb1a36bb080f1da35857f47218dd SHA-256: 1ecfc0cfe1dbe9815b4fccec25f753472866e29411f231372a783f735390562e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=loksatta+epaper+pune+today+pdf+download'. This indicates the document's primary purpose is to redirect the user to a malicious site. The presence of a large number of external PDF links further supports the SEO link farm tactic, aiming to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=loksatta+epaper+pune+today+pdf+download
    • http://files.cbccabinets.com/uploads/1/3/0/8/130813409/pikokaba.pdf
    • http://files.perthimage.com/uploads/1/3/1/8/131857193/kasufurivo.pdf
    • http://kadifel.scubedproductionsinc.com/uploads/1/3/1/4/131407558/5c4dfcd415667c.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/bumulabusaxijukaraluzenim.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/nebutilu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3462/1590/files/wemowopawuxusaruzo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/befowameb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/pudotuwalaximifuwevidonu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/40711205066.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/rivudejibusabusadilak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/shintoismo_libro.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/7732573028.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/47181848522.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/ricardo_munoz_cbt_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4333/8912/files/gomovapefutenagebazefija.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053dc.bin
61e15e96cff4d01d677d287cef0beb45496369cedc4826d4682b4c437160cba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x53DC 5236 bytes
font_01_sfnt_off000065dc.bin
f78db7885f183ffd5c2585967fb3d05994c055023884cd183ef61bf14ae77e06
pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 9764 bytes