Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab94ea6490ab670c…

MALICIOUS

PDF

46.2 KB Created: 2020-08-21 22:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01006758013ee8ea60e0ecdea8bf742c SHA-1: f51e8a7b4158400a144d0f66685adab50865a4c8 SHA-256: ab94ea6490ab670cb7b0f9f1f5f965b8fbbd9e69ab854fe04add90fc02182867
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it's a malicious redirector, linking to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains the text 'Free gradebook template' and the malicious URL 'https://ttraff.cc/pify?keyword=free+gradebook+template', suggesting a lure to download a template which redirects to malicious infrastructure. The presence of numerous other PDF links further supports the link farm heuristic.

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.
  • 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
  • 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=free+gradebook+template
    • http://xofis.resopstrategies.com/uploads/1/3/1/4/131408999/mogajevovix.pdf
    • http://files.kylepe.com/uploads/1/3/1/4/131437660/lixevisobavugam.pdf
    • http://zonifab.thedevilsdispatch.com/uploads/1/3/1/4/131408100/vowifijokigavovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6972/6110/files/dujirixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/39005468194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/macroeconomics_blanchard_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/dezubosezopiwipavamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5621/files/protein_metabolism_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/4971/9720/files/twc_louisville_ky.pdf
    • https://cdn.shopify.com/s/files/1/0431/1633/1172/files/kinokaf.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_off00007682.bin
d143959f01f36e0b18269d2a13859078a8e61ca88db9b4a855b1386e4755d4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7682 5260 bytes
font_01_sfnt_off00008851.bin
8de6337396c9b78d10902ce5eaf804f3c8e78b687536c019aa1c04fb9bb1d514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8851 10580 bytes

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