Malicious PDF — malware analysis report

Static analysis result for SHA-256 500992b3cbdc9166…

MALICIOUS

PDF

45.3 KB Created: 2020-08-03 09:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4988e095b78324392de3b81330f7a94 SHA-1: f848d63e10363db32e973b9f02c31435cc068f56 SHA-256: 500992b3cbdc9166abb251f70d295bb39a2823db3921132435dd24aacb92bd6f
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.ru/pify?keyword=js+array+push, which is a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is central to the malicious payload. The presence of numerous links indicates a likely attempt to lure users to external 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/pify?keyword=js+array+push
    • http://files.jacobspolitics.com/uploads/1/3/1/4/131483148/xafujuvunakajab.pdf
    • http://files.mvireland.org/uploads/1/3/0/7/130739043/fupafovojimeta_kenet_womekore.pdf
    • http://files.siemenswestinghouseretirees.org/uploads/1/3/1/4/131455475/5610675.pdf
    • http://files.180clothing.com/uploads/1/3/0/7/130776158/4144313.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/vimelot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4073/3341/files/48552738764.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sividejujim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/7148541979.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/74771166834.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/41015563248.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/mabudaxem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/rotgut_distillery_bait.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/security_sy0-_501_darril_gibson.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/zenimivaxemodipemirusumez.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_off00005db0.bin
895a5bcde2a423ad2ccc7bc0296d7316985f84ca5acb6fdd42f93d2ee812500e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB0 4968 bytes
font_01_sfnt_off00006e97.bin
9994abed32861e42e5af8d6a116be36ec67161460e7a9528169026da95a2808a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 10440 bytes
font_02_sfnt_off00009277.bin
44d822ee40a4564b9ae271c867aa47bc7dc821ce5342df3c711635b1b6ebf517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9277 16440 bytes

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