Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ba7e1bdfa50402…

MALICIOUS

PDF

36.1 KB Created: 2020-08-31 13:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8207be0f7063f547841cb2a87ce8e38 SHA-1: ccb28d59ecfde6a2ca17209e93e38ea84181ade1 SHA-256: b6ba7e1bdfa50402bd8bc3466286e599051782e406fe91a4700e66e2b73337f9
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm. This suggests the primary purpose is to lure users to malicious sites. The presence of numerous external PDF links further supports the link farm attack pattern.

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.cc/wix?keyword=il+2+sturmovik+battle+of+stalingrad+deluxe+worth+it
    • https://static.usrfiles.com/ugd/a86d68_4cc4adebfe4d469393e5a7c9d19b7ad2.pdf
    • https://static.usrfiles.com/ugd/b48b60_ae763a8357334d3bbfd1d8f2e3125f62.pdf
    • https://static.usrfiles.com/ugd/b8c837_321e63a406674f84b0232b4cc4073adf.pdf
    • https://static.usrfiles.com/ugd/e1d12c_cab095b3fb9849a1b389bcb00433c160.pdf
    • https://static.usrfiles.com/ugd/79e5df_9f1e5301b7ed4ef38893a044bc4546c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_edaa6cb7a74a450c919441e89df33d72.pdf
    • https://static.usrfiles.com/ugd/e4a001_dd18d365c9144bddba536bd93636fec5.pdf
    • https://static.usrfiles.com/ugd/cb2bed_50459a8189f4468292ffcdddbf29c947.pdf
    • https://static.usrfiles.com/ugd/12f4eb_845862bb64df441aac095c674e6e8397.pdf
    • https://static.usrfiles.com/ugd/10b11f_42eeec7ad0e043aaaaa0806ab93a042b.pdf
    • https://static.usrfiles.com/ugd/f65518_8d1bf09231e24c1ab7f8bf8e7632d4d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_353b0119927641cb82803edbdeb8fc6f.pdf
    • https://static.usrfiles.com/ugd/96768c_38a2555ec58c45d69c538c607163f2dc.pdf
    • https://static.usrfiles.com/ugd/0a0016_32a848b628d24fceb9c67d043ee4bb49.pdf
    • https://static.usrfiles.com/ugd/277b62_741c420e732d4d42b5505e2c24bc2620.pdf
    • https://static.usrfiles.com/ugd/9ea91e_8042aba620064b36aff070a26ec2c49b.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_525beb91a53c4428bb0e5225aec23787.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_off00004d73.bin
c4a742fd6357585a4ca2afc719b0fe9199a1ac7faee5235a722820e18ae3bfb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D73 5812 bytes
font_01_sfnt_off00006128.bin
db732db5c569d63da45888f5f2a8608113fe42f7b15cb63433aff80df33618d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6128 10108 bytes

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