Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9324e1fbb435c30…

MALICIOUS

PDF

55.5 KB Created: 2020-09-06 12:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a97d76a116038756283aaf3718aff2 SHA-1: 71dbb58b353a4d609dacd959c7769dbd1f04b9af SHA-256: c9324e1fbb435c3032629147c02b1fe836dbb600d27258bfa52401f8c514c78d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics and the list of URLs. This suggests the primary goal is to redirect the user to malicious content via the provided link. No scripts were extracted from this sample.

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.club/wix?keyword=ben+10+title+song+tamil
    • https://static.usrfiles.com/ugd/77941b_485f8632a5ae4094b371751ce913eeea.pdf
    • https://static.usrfiles.com/ugd/5b604d_566103ae0b94498c8231191776db420d.pdf
    • https://static.usrfiles.com/ugd/b8c837_072b4975e4c64ac4a3ebded16938a1e0.pdf
    • https://static.usrfiles.com/ugd/762c1a_70ac944dd51f4073a7d8c016afe1305e.pdf
    • https://static.usrfiles.com/ugd/9c8fb9_0b5367fc371049f0800941416f8c4724.pdf
    • https://static.usrfiles.com/ugd/b28561_cac0b5844754477392bc740e074a8b89.pdf
    • https://static.usrfiles.com/ugd/a44510_dccd8e2a4f5a422dbc45c9d1960c7618.pdf
    • https://static.usrfiles.com/ugd/a18aa6_0081dbad84f34a1482cb21c401d3ff7d.pdf
    • https://static.usrfiles.com/ugd/868b90_dd1661efa85d494aa002cde664a8d018.pdf
    • https://static.usrfiles.com/ugd/bca722_a080491e4ae74dc5b663da822a975790.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/25841195773.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/pigisidixeruloremeraf.pdf
    • https://cdn.shopify.com/s/files/1/0435/6754/6527/files/54833168258.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/48387813638.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/5818514070.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000712a.bin
a1285ff1edde827a5d955547868b3c3caaffd828a5d31245c86dc0c57421f9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 4940 bytes
font_01_sfnt_off000081e2.bin
5d3d9e1fe246ccf7063e8e8a12dc8f3cabffb9227a0d2397f261894112df5cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E2 5480 bytes
font_02_sfnt_off0000938c.bin
d5245c9e29429349331b55a9907be3e9f59d5b0b51c4fbeb00fed4147f48efec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x938C 15540 bytes
font_03_sfnt_off0000c27e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 4324 bytes

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