Malicious PDF — malware analysis report

Static analysis result for SHA-256 c159620e47f77d3c…

MALICIOUS

PDF

45.2 KB Created: 2020-09-01 05:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f8e62c19815624fdb7495ad7ef5068a SHA-1: bfd80cb063a56b0a92285dccf874d62d55bc601a SHA-256: c159620e47f77d3c75f962857a22dd589c4f0f63d64f94230a46dc14eee0931e
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised with a seemingly relevant keyword. The document body, though heavily obfuscated, contains the same URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness.

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=clothes+dryer+consumer+reports+best+buy
    • https://static.usrfiles.com/ugd/f967ac_e52b59529be24a6db5c0a9e9cd8a75e8.pdf
    • https://static.usrfiles.com/ugd/74a852_319617c653a94285bf327a4256950e7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbad77c40c464302a7f3396c96280163.pdf
    • https://static.usrfiles.com/ugd/0c268c_09d1661d74f646bcbb887931ff7370e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e62dca9eb4164cc580e4e8856dd25dcd.pdf
    • https://cdn.shopify.com/s/files/1/0432/4871/3896/files/bobemonevumuroja.pdf
    • https://cdn.shopify.com/s/files/1/0465/1207/9006/files/19153787779.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/juwunonetetoxalowozesalef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/febukovar.pdf
    • https://cdn.shopify.com/s/files/1/0440/4684/4054/files/43424155862.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ab8d2e2da394f6191214d53b1402e32.pdf
    • https://static.usrfiles.com/ugd/0c41e7_b685fa98e5ec4e63981dad61fa38ca52.pdf
    • https://static.usrfiles.com/ugd/0aab01_2ea10904d69b4930b2359cbe9c1a2f4b.pdf
    • https://static.usrfiles.com/ugd/1f6d71_569ce27323f84ef895103e33cbf4c7ec.pdf
    • https://static.usrfiles.com/ugd/f84671_17090946f852436ba99c5af1706d5fcf.pdf
    • https://static.usrfiles.com/ugd/739437_0e7caf5eac0f4a22ab282a60844cb00a.pdf
    • https://static.usrfiles.com/ugd/c33cdb_c2d505859353426dbdac30b0de7adf32.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/
    • https://cdn.shopify.com/s/files/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721a.bin
a10570ff6c698111b394623f4d7623a3aade65d314a9a6c1c2cdb237cad43a25
pdf-font-stream PDF embedded font (sfnt) at offset 0x721A 5248 bytes
font_01_sfnt_off000083c5.bin
cb21f1d50324e0fc10b8b84ce68cdb877427fb47df02418829d1a2df0b787427
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C5 10376 bytes