Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cbd1501c91be87…

MALICIOUS

PDF

43.8 KB Created: 2020-08-04 23:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ea7bb233e4b327d353420f13178788 SHA-1: 4bc896d69336a91dd806bbe1a3af0035c9776aef SHA-256: 79cbd1501c91be871d22697a879510f0b27261d30db390e646f7b0bd11e54127
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=pfms+bank+list+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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.cc/pify?keyword=pfms+bank+list+pdf
    • http://files.oculonco.com/uploads/1/3/2/6/132682134/poxemavifupa_perunizowe_kobufete_wijebi.pdf
    • http://files.niakohimura.com/uploads/1/3/1/4/131452904/gezarigafu-gafitusena-fepeduwube.pdf
    • http://files.border-lands.com/uploads/1/3/1/0/131070483/dugufakozubutipa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/zafujup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/60012638125.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/anglo_saxon_literature_beowulf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/13788166018.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/bijuragodifane.pdf
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/womezilulid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/85544715736.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/88069966864.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/82660854956.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f85.bin
5ef798b2b54f635ae3dc0481d1ecf3e9f1155004f8101110b01394fc0628a77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 5296 bytes
font_01_sfnt_off00007175.bin
05f796c35b789481810077879c7172d271a426f41ef7a346a5203fd8ef63819a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7175 9816 bytes
font_02_sfnt_off0000934c.bin
eb6057a7208ebc3ffb3a548ef1fb0e9444fca6c925d9aa47d7e1e76111bb1258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934C 3912 bytes

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