Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4b7625779b5198…

MALICIOUS

PDF

53.7 KB Created: 2020-08-06 20:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e0ab166184710581ff0aac2d83dfcc8 SHA-1: 4ab736bcfa9a6b77b5ef64e5f8ec50078d12b48e SHA-256: 8b4b7625779b51983c5280cdf06262f8d8523ff45a5ed5699e3194c9f83d5982
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on various domains, including a known malicious redirector at ttraff.ru. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The document body contains garbled text and a reference to the redirector URL, further supporting this attack pattern.

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.ru/pify?keyword=allowable+stress+design+pdf
    • http://bifiwepa.graingercountytomatofestival.com/uploads/1/3/1/3/131384429/mazixalulamiro_wezusilab_zilajunub.pdf
    • http://files.huliauapaa.org/uploads/1/3/1/3/131383791/natujigipulev.pdf
    • http://files.discerningheartsministry.net/uploads/1/3/0/7/130775544/5926698.pdf
    • http://files.walkthruyoga.com/uploads/1/3/1/0/131070579/27a4faa253d67d.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/chemistry_of_hazardous_materials.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/rigomapalafiviti.pdf
    • https://cdn.shopify.com/s/files/1/0440/1886/0190/files/62404375507.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/35962348983.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/68179059041.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/47404491822.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/78267745426.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/watojoxeruxoluvarixeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/71392625317.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/kavukuliwurolatika.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/99362403366.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/85564933377.pdf
    • https://cdn.shopify.com/s/files/1/0433/1057/9865/files/50105150070.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/28626021039.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_off000072a9.bin
822864e27c1c3672b1c55c950656402a0ff5253cb591c36014bd3edd60a4bacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A9 5540 bytes
font_01_sfnt_off00008568.bin
d111aa9ceb4f5644aba51f909fc2297fdc47b12f92db6508565fdf378bc83c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8568 5220 bytes
font_02_sfnt_off0000973c.bin
f04caeced2f9719dc017e8dc4a54db9ea91d27045116079ee0c6c74605add127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x973C 10408 bytes
font_03_sfnt_off0000baef.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEF 4324 bytes

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