Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac483c92f6a38ad…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 12:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee598c0aece5e69b1dd29de6f949e4c4 SHA-1: 057335387bd516a9d97e46d5b587330b8d24216b SHA-256: 4ac483c92f6a38ad0b1759860f7c408a7ee35f8d8c446cce24a3855dfdaab3a6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body text, though partially corrupted, includes the target URL 'https://ttraff.com/pify?keyword=bwv+999+pdf+piano', suggesting a lure to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=bwv+999+pdf+piano
    • http://veximuwu.shodocalligraphy.com/uploads/1/3/1/4/131438079/disimanotom-gofarov.pdf
    • http://files.lotusbloomfamily.org/uploads/1/3/0/7/130775249/jisofevemes-saweseraxetusu-beginan-lejevez.pdf
    • http://files.themanhoodtree.com/uploads/1/3/1/4/131453870/c02e1734d19.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/navaradon.pdf
    • https://cdn.shopify.com/s/files/1/0440/5323/3814/files/petzl_crevasse_rescue.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/nogutefibuxeranuzalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/lasonudotuxogalopeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/deremobafuvapopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/foxovazexetiferesenos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/pesenotumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/tokedisiputamuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8286/6072/files/74247725453.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/xoxofoboza.pdf
    • https://cdn.shopify.com/s/files/1/0437/1303/6439/files/storia_riccioli_d_oro.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/58404407509.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/46787661082.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_off0000625c.bin
b79dc2f2fefe54f367ab46f5d3d05857a6fbc1029680203b62bffdd037233e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625C 4676 bytes
font_01_sfnt_off0000725f.bin
4aec7ec08b2a3f4b18b01339606160631cd042e391e285aeb4f0f83ffb635c15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725F 10192 bytes
font_02_sfnt_off00009543.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 4324 bytes

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