Malicious PDF — malware analysis report

Static analysis result for SHA-256 186a48f5cc1132ac…

MALICIOUS

PDF

46.4 KB Created: 2020-08-29 00:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c1cbf2b67c6df7e319f017065d91c5 SHA-1: e22892930850d601647290ae2ae363568de96473 SHA-256: 186a48f5cc1132ac2e1f771b79840cdbd4c08841df55a1a45499eb49cc2df95e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body also contains this URL, suggesting an attempt to direct users to a potentially malicious site. Additionally, a large number of external PDF links were found, indicating a link farm, with one pointing to Shopify. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=nursing+education+books+for+msc+nurs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/mudozelideraxoxusimower.pdf
    • https://cdn.shopify.com/s/files/1/0435/5509/4689/files/52521041117.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/50114501632.pdf
    • https://cdn.shopify.com/s/files/1/0433/0668/0484/files/51553947125.pdf
    • https://cdn.shopify.com/s/files/1/0437/8663/3377/files/current_and_voltage_in_series_and_parallel_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/nopuzagadugul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/bafeweferigavarijeduvage.pdf
    • https://cdn.shopify.com/s/files/1/0434/3942/3655/files/zipozezadivozekelulimagub.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/37278903204.pdf
    • https://cdn.shopify.com/s/files/1/0437/7772/0469/files/customizable_cheerleading_uniforms.pdf
    • https://cdn.shopify.com/s/files/1/0431/9071/4532/files/masez.pdf
    • https://static.usrfiles.com/ugd/b8c837_3648b8f97c8f40eaa802007c7e96c16d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7504b0b7e3dc433197a63072daea3542.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fbaa83ccf6542bd8792aaad004e0829.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000742c.bin
88e3ff34b33e99c2f58fbd68f0c83fa7a2a2ce9624c38b75ce3015330f71a894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 5484 bytes
font_01_sfnt_off000086c1.bin
3f3791990204517df084eb2c31064769b83bac7c91a3faafe6f9e74826864375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C1 11888 bytes

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