Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bac6771ad27bdc5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 16:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c58f40d2393c55bd7ddb1f3d53475a SHA-1: 2f632de9f32ec8889368cc5e83d4eb81b9c162de SHA-256: 6bac6771ad27bdc5b9df20833ee735d549730a8d0fb8a38b13335406ac5a7edc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is indicative of SEO poisoning or a link farm. One of the primary links, 'https://ttraff.ru/wix?keyword=alquran+alkarim+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest a lure to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=alquran+alkarim+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/osrs_elder_chaos_druids.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7417/files/44687552318.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/90952114899.pdf
    • https://static.usrfiles.com/ugd/50de67_8798f32899b54bacaa02072387bd63b7.pdf
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/bandobast_telugu_movie_movierulz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/mupulaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4882/files/26502873957.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/joxurutuxedipakigikedag.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/lubulelewaketu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7647/5290/files/asagao_to_kase-_san_batch.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/bilifutuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/oman_air_ground_staff_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5224/files/maretiru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7632/1434/files/82937961001.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000833c.bin
5da7570254f18ca3e3da80efd60ce7ea5ff2862977b7878e53df8e83cbbab3d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x833C 16672 bytes
font_00_sfnt_off00004662.bin
f3daa65272ddceb1304e322d3439fe4d3e35ee22229706d3f5599b79a6362777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4662 3384 bytes
font_01_sfnt_off0000527d.bin
6f57e6f81a78467750eba0e5023ce334c43408cdc12424cbaa2193945081c415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527D 4760 bytes
font_02_sfnt_off00006277.bin
08b6d45d81315ccec5cff2a8e4b3b925a63f496b9f24b7c5b3347d4632affce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6277 9512 bytes
font_04_sfnt_off00009a73.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A73 4324 bytes

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