Malicious PDF — malware analysis report

Static analysis result for SHA-256 a830f2c4c7fa32b9…

MALICIOUS

PDF

38.0 KB Created: 2020-08-04 18:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c601465dff41fbccad2242d697ae86b2 SHA-1: 7ed58455333bf9d579e9f494b0cbbe8f8870c336 SHA-256: a830f2c4c7fa32b9b586c941b78e64946c5fa915566cfcb21b0d33f11a9ff5e9
128 Risk Score

Malware Insights

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

The PDF contains a lure for a download, and a critical heuristic firing indicates it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=cards+against+humanity+pdf+download, which is likely the initial stage of a malicious download chain. The PDF also contains a large number of links to other PDFs, suggesting a link farm SEO tactic.

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=cards+against+humanity+pdf+download
    • http://files.carrbridgeselfcatering.com/uploads/1/3/0/8/130874435/856133def98.pdf
    • http://files.bradleypmartin.com/uploads/1/3/1/0/131070689/4264110.pdf
    • http://files.annaruth.net/uploads/1/3/0/7/130776861/3258794.pdf
    • http://files.aliceannephotography.com/uploads/1/3/1/3/131379447/xisejexopore.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/87990263463.pdf
    • https://cdn.shopify.com/s/files/1/0432/6647/4139/files/modobotozebirexekafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vekedexixerokasadoboma.pdf
    • https://cdn.shopify.com/s/files/1/0430/7520/7322/files/70967148335.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/setiloxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/floureon_cctv_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5243/3557/files/40205991357.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/les_assises_fiscales_au_maroc_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/baralijasesoketaxenowan.pdf
    • https://cdn.shopify.com/s/files/1/0428/7217/6799/files/77829837172.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/98723800399.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_off000055a4.bin
a95f95e940dc3a1f2dce7c75555c0cd9f8f57238abfbb947ee606f059f17380e
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A4 5552 bytes
font_01_sfnt_off00006872.bin
bfe446898a5bb59bebb67b86bf44170f8c4861494eca6022a9e7f92cc38d1eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 10180 bytes