Malicious PDF — malware analysis report

Static analysis result for SHA-256 f290a4206ea7e4d1…

MALICIOUS

PDF

36.4 KB Created: 2020-08-30 22:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f13ee428f56350cfcf7c6feb9e8ff523 SHA-1: 2fea764cd24c7e25cf836bc8d619580ad66a2332 SHA-256: f290a4206ea7e4d1d00a4b701175a438682c640053872ed5151ea1bc5e692047
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to known malicious redirector infrastructure at ttraff.com. The document body, though heavily obfuscated, contains text related to 'little alchemy 2 hints' and the malicious URL, suggesting a lure to trick users into clicking the malicious links.

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/wix?keyword=little+alchemy+2+hints+how+to+make+t
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/foxomom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/bafobubapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5039/files/87474961190.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/talent_management_and_succession_planning.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb27de6cef0b4598afe0d75b800c6143.pdf
    • https://static.usrfiles.com/ugd/b8c837_d411eca74660407d873d09231a012fef.pdf
    • https://static.usrfiles.com/ugd/b8c837_acdc47bf398343a98fbfd49e15e1a2b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd080db55ec54f028f44cb67d5a5092d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0434/6950/4662/files/reset_synology_nas.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/pefamalukeba.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/45437346400.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/23047971698.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bc6a584438644838b5e22bc81baf359.pdf
    • https://static.usrfiles.com/ugd/8acad3_cd7f1d0c234c46d7bb5bf6f35045fd00.pdf
    • https://static.usrfiles.com/ugd/e3c460_c03f0ef13c474af5aee5156b93020629.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f98010e7f1a449c86d15ffb029b3a66.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9a5f1c605a6426e87f9e7d95393b706.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb8.bin
bf677608addd9cfff62c49ca7fa1e540dbdaa71f9e1df5a06a9f7119ea4186d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB8 5276 bytes
font_01_sfnt_off000061a5.bin
129418d0e5306bfa607a95d5f7338d3cac108a46fd2754205db8b7ad4d28ef28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 10220 bytes

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