Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c83b9c6217e56f…

MALICIOUS

PDF

40.3 KB Created: 2020-08-27 14:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a140fba91f4c89d016e5a9bad0f8f7 SHA-1: 99d5eb9e8f0b79edd26f49a0a6de79177b421665 SHA-256: 91c83b9c6217e56fe7fb68c39ccb6b3f19feb5e6bb039db9cd6886acc3c47ac5
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious link, 'https://ttraff.com/pify?keyword=bs+tweaker+3+free', is presented to the user, likely as a lure to download further malware or phish for credentials. The document body contains garbled text but also includes the malicious URL and a benign-looking Shopify URL, suggesting an attempt to disguise the malicious intent. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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=bs+tweaker+3+free
    • http://dufire.design-disability.org/uploads/1/3/1/4/131406515/zudibidal.pdf
    • http://lojurile.bellcitypaving.ca/uploads/1/3/2/6/132695742/venimozu.pdf
    • https://cdn.shopify.com/s/files/1/0446/4974/2499/files/android_image_from_url_github.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0432/files/zunozaxep.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/authentic_assessment_methods.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pisanebemewamabojesodid.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/lirosuloxuzufubojutuwogek.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2616/files/main_bhi_badiya_song_sanju.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/cashless_economy.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/adornos_de_navideos_manualidades.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/16305293751.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/6044385461.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3668/files/muxakipev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/mikamizoduwu.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_off00006040.bin
1a01dda195aed72f79044acc6eb3dc7a1be08b4493c84fbcae807f8c10756533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6040 5096 bytes
font_01_sfnt_off000071c4.bin
e31cfe857517b8483f5f775641112bdc8a0f24bd2762dee22d34e6ff945254e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 10272 bytes

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