Malicious PDF — malware analysis report

Static analysis result for SHA-256 5135c6f78d1a0ee5…

MALICIOUS

PDF

47.9 KB Created: 2020-08-08 20:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de1f43804406ecb16106ab8a79942c40 SHA-1: 81ccbcde450f55b69e881e5a96737800a1d4662b SHA-256: 5135c6f78d1a0ee558681457aa3423400d036b1c4db7990972c2a27617449ead
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the string 'https://ttraff.ru/pify?keyword=definition+of+development+economics+pdf', indicating the lure. The ML classifier strongly supports the malicious verdict.

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=definition+of+development+economics+pdf
    • http://files.taraloveperry.com/uploads/1/3/1/6/131637131/nepogonuwata.pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdf
    • http://files.oldbrooklynconfectionconnection.com/uploads/1/3/1/4/131437848/jivilapudexuw.pdf
    • http://files.emmashoosmith.com/uploads/1/3/1/4/131411542/dowimi_najimi.pdf
    • http://files.wainfleetskating.ca/uploads/1/3/1/3/131397987/5e16c6dc536efc.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/el_neoliberalismo_en_bolivia_1985.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/99698016146.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/13459190995.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/59727094724.pdf
    • https://cdn.shopify.com/s/files/1/0433/5586/5243/files/24672466167.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/likatisukanimobel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9902/9655/files/vakademeloxejim.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/rawab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5040/files/90103477935.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/fungsi_budaya_organisasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/uninstall_vmware_fusion.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/
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/99698

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d9c.bin
20caa371e56f5ea6c363b15fc32448cf9794c32cc7478dac5625c2d89da405ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9C 5056 bytes
font_01_sfnt_off00008ed6.bin
9456eb5a2e260577f0694864f126f18471d9250759c93aa4596bb2d5a0768340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED6 10372 bytes

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