Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebb22cbeaa5abc1…

MALICIOUS

PDF

49.4 KB Created: 2020-07-21 07:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4189c0e35f508890c4b94a6b4d4c8b SHA-1: 38a3a992595b80398ce576780a7cb79638962e4c SHA-256: cebb22cbeaa5abc1592207c15eb24889d0572c77c64fa57e22628551396b8625
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The PDF contains numerous embedded links, many pointing to Shopify domains, suggesting an SEO link farm strategy. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'power transformer commissioning procedure pdf'.

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=power+transformer+commissioning+procedure+pdf
    • http://files.donaldson7.com/uploads/1/3/1/0/131070993/wibom.pdf
    • http://files.sammybeaugard.com/uploads/1/3/0/9/130968972/tukojibetezemiwotuw.pdf
    • http://files.laucandrique-en.com/uploads/1/3/1/1/131163920/wigipiravoxup.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/bomakomeruk.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/38690861495.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/83737752763.pdf
    • https://janojape.files.wordpress.com/2020/07/74383171216.pdf
    • https://zigebop325234046.files.wordpress.com/2020/06/givarijepawik.pdf
    • https://mosozedegan.files.wordpress.com/2020/06/93337975547.pdf
    • https://potataz.files.wordpress.com/2020/06/zaxarapowedufapawose.pdf
    • https://makevuxew.files.wordpress.com/2020/06/30436962983.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/14671886934.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/86818134252.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/nemonibujux.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/64619703025.pdf
    • https://cdn.shopify.com/s/files/1/0430/9044/4445/files/78758830416.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/dunemej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/60685209096.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://zigebop325234046.files.wordpress.com/2020/06/givarijepawik.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083c3.bin
796612fb8354778eaf0f7b7d2971e2101aa4375a3e018c0bdefa66c7ac15c544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C3 5416 bytes
font_01_sfnt_off00009623.bin
855f56b4eca6237e980023d2817e2158de5a94418454e2932021e5914e1dd42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 9932 bytes

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