Malicious PDF — malware analysis report

Static analysis result for SHA-256 43573e54925d1848…

MALICIOUS

PDF

50.7 KB Created: 2020-08-30 09:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23d9d7854bc3f4c376d66db7a492af55 SHA-1: 0a029bac63bcf2875f1bf44bbf126e4158cb9ff4 SHA-256: 43573e54925d1848d39ba46736767a47041d89d8aede64ce211e8c5dcd88c8eb
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing. This indicates the document's primary purpose is to redirect users to malicious infrastructure, specifically identified as 'ttraff.ru'. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, with the first one pointing to a Shopify domain, suggesting an attempt to obscure the malicious redirector or leverage legitimate platforms for distribution. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

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=acer+chromebook+spin+15+review
    • https://cdn.shopify.com/s/files/1/0435/6197/5971/files/toxoplasma_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2696/files/99609343715.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/30316029209.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/waxex.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/sally_sells_seashells_by_the_seashore.pdf
    • https://cdn.shopify.com/s/files/1/0461/3328/0921/files/gedunopabujasom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1109/files/mac_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4713/files/59427880807.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ba0899f1c3b4c5b88aad73add6155e6.pdf
    • https://static.usrfiles.com/ugd/b9801a_29dc4fc0099a470795b37d300f747c46.pdf
    • https://static.usrfiles.com/ugd/b8c837_b06b5aaf1a4144489b5c9a0afeb24d87.pdf
    • https://static.usrfiles.com/ugd/b11f6d_88045447f499470e8a07e78a25355b5d.pdf
    • https://cdn.shopify.com/s/files/1/0434/2205/6600/files/gomujez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/82954085516.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
stream_005_off0000a031.bin
62c7777bc4803cf9ca08be9704c5d5baa14538a40f8869905a32e0a65e3b1622		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA031 18672 bytes
font_00_sfnt_off00006b43.bin
e149b07e69b098cc9a92819a47c262cfd1ec4b0eac1d3e8bee99d26f5bd34478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 5452 bytes
font_01_sfnt_off00007dc4.bin
94ea33081938221955afecfee018c7fb6eddeb0281698ea305dca09c6226fdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC4 10024 bytes

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