Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bab0a546c37ff6c…

MALICIOUS

PDF

37.8 KB Created: 2020-08-06 12:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7056551f4486c64b12125f15c5b308a3 SHA-1: 302d241ceea06c1c25c93d1ff4e43221e15b8b7c SHA-256: 6bab0a546c37ff6c63c47701808cb4f85da6a620d8c74ceb556d42dbddfa4faf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains references to 'file to pdf merger' and includes the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are to Shopify, likely to obscure the malicious intent. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

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=file+to+pdf+merger
    • http://files.marthomawashington.com/uploads/1/3/1/6/131607110/2651807.pdf
    • http://files.debhenry.online/uploads/1/3/2/7/132712206/5542071.pdf
    • http://files.stjohnhamilton.org/uploads/1/3/0/8/130874026/2043563e03dd6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/connect_four_java_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/noxejopulunadutegaka.pdf
    • https://cdn.shopify.com/s/files/1/0435/4650/9461/files/eureka_easy_clean_71b.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/ap_stylebook_2017.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/bridgeport_milling_machine_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0433/6196/0091/files/komotividituratopetewow.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/78055212016.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/banunapuviderezukusixozon.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/58703975770.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/what_is_memory_leak.pdf
    • https://cdn.shopify.com/s/files/1/0429/2355/7030/files/vewuniwi.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b36.bin
ec79149255700f2b7f3f1a89feb274774668d6b1bd13c93932c8c8adc446809e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B36 4612 bytes
font_01_sfnt_off00005ae2.bin
bcd3fc5bd0174d32ea858eefe76d53743e921517b806425f580107b9b5edd014		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE2 9820 bytes
font_02_sfnt_off00007c7e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7E 4324 bytes

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