Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff256f822f0b85a…

MALICIOUS

PDF

42.1 KB Created: 2020-08-23 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43512620e2d67052bab41eb5730da403 SHA-1: fe6f8a5a18e60463db9b9dd9029c084ed51c846e SHA-256: 4ff256f822f0b85a8dc1d2e4f6fbdc6cd7c158e35539ca8d2edef21a403a5827
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body is heavily obfuscated and appears to be a corrupted worksheet, further suggesting a deceptive 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.ru/pify?keyword=heart+circulatory+system+worksheet
    • http://rezaxe.tintawitaelderliving.com/uploads/1/3/1/4/131406082/dipebinav_mugujejagar_lejisegubamijib_metusogupur.pdf
    • http://pozanoko.joannajensen.com/uploads/1/3/0/7/130776031/2411129.pdf
    • http://files.stclairwesterndressage.com/uploads/1/3/0/7/130776826/ce654360.pdf
    • http://files.portogether.com/uploads/1/3/1/0/131070612/bapuravafu-gititagefu.pdf
    • http://files.lama-lab.com/uploads/1/3/1/4/131483148/totegenuruziba-nijugufe-mokitedowofali-raxakaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6307/4213/files/neguduvezadedibubivugaxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/how_to_perform_amperage_draw_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/45524522577.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/19859163906.pdf
    • https://cdn.shopify.com/s/files/1/0450/7385/8710/files/all_things_bright_and_beautiful_poem.pdf
    • https://cdn.shopify.com/s/files/1/0440/2577/4245/files/46520408025.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/pupivitotunolape.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/rewabavutoxej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051ef.bin
1246cb92991f49f6d2ec831f313408832ea65ef8dd05a758154b162e9f79d875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EF 5260 bytes
font_01_sfnt_off000063b9.bin
2aebc223d1002fdb9a265590f88265e3be6f792fb2215481890ac332162a7552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 9924 bytes
font_02_sfnt_off000085e0.bin
b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E0 16088 bytes

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