Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a1abe491e4979a…

MALICIOUS

PDF

54.3 KB Created: 2020-08-10 08:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ab8d28c6d0e6a50af9ea709cc9583f SHA-1: 480ee54b6993c4f2e4013efde07d4c65d6f0c992 SHA-256: a5a1abe491e4979a344a0af9c0297819d1e10683830a2dd61453fc17dc6b76af
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, likely for SEO manipulation. One critical heuristic indicates a malicious redirector link to 'ttraff.cc', which is used to obscure the final destination. The document body contains phrases like 'free download pdf' and a call-to-action, aligning with a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=ca+inter+books+free+download+pdf
    • http://files.theaccelerationproject.org/uploads/1/3/0/7/130740175/zewusutolo.pdf
    • http://files.unccmsa.org/uploads/1/3/2/7/132712514/6531109.pdf
    • http://joriwijam.vesselhouse.co/uploads/1/3/2/6/132681352/2975518.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4696/files/castrol_power_1_20w50.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/aeonaxx_spawn_points.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/29199368886.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/2211448444.pdf
    • https://cdn.shopify.com/s/files/1/0428/5100/8671/files/81098720815.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/44577067953.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/malayalam_bible_full_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/bivepumov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8833338052.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/94678798987.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/24478710771.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1200/files/kokip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/99882063177.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076d7.bin
9acf94f8c550752fd76a12c1689db12f0a87e87050a6a79f2760e44d828fc355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 5236 bytes
font_01_sfnt_off000088b9.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B9 2320 bytes
font_02_sfnt_off0000930c.bin
48d21515a84523f930fedef13af6d2b156e763128fa9ec3b4b97495b4151c695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930C 10076 bytes
font_03_sfnt_off0000b5b6.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 16224 bytes

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