Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aca1cbd66da74b3…

MALICIOUS

PDF

46.5 KB Created: 2020-08-19 17:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1538e7c3ec33aeacf07e6de75b3099b7 SHA-1: 724c0f9a1cbb63a98ea2bfbac67361c202f9bb4c SHA-256: 8aca1cbd66da74b306d57462b69ef413037c3439e62d79e217294eb07b387313
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, hosting numerous external PDF links, many of which point to Shopify. The primary malicious URL identified is https://ttraff.com/pify?keyword=fully+classified+balance+sheet+narrative+format, which is likely used for redirection. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious intent.

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=fully+classified+balance+sheet+narrative+format
    • http://wusud.corinnelightweaverstudio.com/uploads/1/3/1/4/131408183/buwifonowej-movifesarazag-jawavasowulezi-vatokiwazuz.pdf
    • http://files.solidbrandapparel.com/uploads/1/3/2/6/132681694/winavodokime_febiwarovixasup_jopisujezizub_negegoweni.pdf
    • http://files.northislandpag.com/uploads/1/3/1/4/131437701/jeloxikofilojojetuxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/62968005945.pdf
    • https://cdn.shopify.com/s/files/1/0438/9063/9016/files/frankenstein_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/54625412954.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lawup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/jarodoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/11225917802.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/kobaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6690/9081/files/29418061863.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/storm_brigid_kemmerer_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9945/5642/files/kasozuxojinofikemipojuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/wagepipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/jazz_toni_morrison.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_off00007774.bin
11840d98c53771aee3f8b37216db834e1b0d4bc157cb67b94aafa9a3ee88401a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7774 5520 bytes
font_01_sfnt_off00008a0a.bin
97f1e5cfc32ea019199d31cd66d65da262ed0843ba73c97e471635f897ce97b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0A 10196 bytes

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