Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c458ee5067cbd6…

MALICIOUS

PDF

58.7 KB Created: 2020-08-30 11:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15fb0c50d32d35ed95861008e84ffa53 SHA-1: 22841d4d48cbb2b52b192970d462b8ea8b587b6a SHA-256: 98c458ee5067cbd623590c0f6fc7127d29f6e7dde898bbf092065649180a4dce
152 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 link to known malicious redirector infrastructure. Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO poisoning or malware distribution. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of suspicious links points towards a campaign aimed at redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=after+4+pdf
    • https://static.usrfiles.com/ugd/93c935_9434fba34873425cb4feaa4d1e5cc48f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a14da25cc78048a3a60dba82ab30c952.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd06bd06baf434aa44f185218b28860.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7971/files/tejobewilodavadekuwinunov.pdf
    • https://cdn.shopify.com/s/files/1/0464/2347/4328/files/89308159332.pdf
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/91297740236.pdf
    • https://cdn.shopify.com/s/files/1/0459/6164/2144/files/12742328497.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/3835649510.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ac94d7694e49bdafb1d80a59324829.pdf
    • https://static.usrfiles.com/ugd/f80014_ed9ab51ae2604390b4cca1b51fcd1d4b.pdf
    • https://static.usrfiles.com/ugd/b77b08_56afe24d4cf0455b903a679ac0cb695a.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/kolisipoxojukanukozetafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/dodejusotokibatipeteramo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4640/files/windows_10_enterprise_iso_msdn.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/xezevudamekuw.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000659d.bin
772e4c262d514109234b30fca3e4b0088751070e14f324e543bb8f9ea93a599d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x659D 12768 bytes
font_00_sfnt_off00005598.bin
70b1288fe02e318bddd72949bbc2154beac816e94ad2fab2c456c9f4b70dfecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5598 4692 bytes
font_02_sfnt_off000089ff.bin
fb192184a9b49167f173a558adfd957d10f88aa0621573d0e2f36f2d24b9b9b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 5464 bytes
font_03_sfnt_off00009906.bin
19b73cf0a22dfc9286d76485eb758538f567185957240a73bf81a7add6130b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9906 13996 bytes
font_04_sfnt_off0000c519.bin
20f2effbd9e15a534bc3dba97bec677d11e663d0837e6ab23fd54d43e15e3939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 16624 bytes

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