Malicious PDF — malware analysis report

Static analysis result for SHA-256 af792d00eaff883c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-18 20:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 759e2abf4577349a55cff14bb05b00e8 SHA-1: 37db7991c442106b0167fae2d73427a12bb79923 SHA-256: af792d00eaff883c35f35d1f13bb47374862dc9f5fd5a32866471f53ebdb62c6
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify, suggesting an SEO poisoning attempt to drive traffic to malicious infrastructure. The primary malicious link, https://ttraff.com/pify?keyword=piecewise+functions+worksheet+algebra+1+pdf, is identified as a redirector. The document body, though heavily obfuscated, contains the same keywords and URLs, reinforcing the lure.

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=piecewise+functions+worksheet+algebra+1+pdf
    • http://files.all-american-gymnastics.com/uploads/1/3/0/7/130739204/bed6036576c2e0.pdf
    • http://zijukin.cakeballsforacause.com/uploads/1/3/2/8/132815176/142561.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/calikusu_book_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/5099/0753/files/598808668.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/71697216816.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2804/files/37442393863.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/dmrc_metro_map_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1657/5383/files/music_box_dancer_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/exo_barycentre.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/51003913477.pdf
    • https://cdn.shopify.com/s/files/1/0438/9391/5800/files/20901817103.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3281/files/61552318979.pdf
    • https://cdn.shopify.com/s/files/1/0429/1215/3766/files/binghamton_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/96711784515.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_off00005584.bin
a2e6f0eac597c18974cb6bc1def41f5c94dd7fa7d7d0798812f7ddf01fc58bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5584 5768 bytes
font_01_sfnt_off00006934.bin
cb31fed9d6edcb3cc0254d22413d1380672aa54e9cfe342f46feaaf1a6b33bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6934 9884 bytes

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