Malicious PDF — malware analysis report

Static analysis result for SHA-256 b619517528ef53a3…

MALICIOUS

PDF

53.3 KB Created: 2020-08-30 05:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e01f2fac669853fd5752b1185c9db398 SHA-1: 9abc4c6aa04e9aa48a8dad5401773820bbe441c1 SHA-256: b619517528ef53a3bc00b5ce210fe1e58ae36e7a61a0d5d3667c6286f4eb034c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'stardew valley fishing switch' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, which are likely part of a link farm to improve search engine ranking for malicious content.

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=stardew+valley+fishing+switch
    • https://static.usrfiles.com/ugd/a76634_cede8904e9a44183aa01204436123c84.pdf
    • https://static.usrfiles.com/ugd/3f80ec_1e4eeb30645d4e79bcb9c4c5b54fdfbe.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_61aa300bf34a44b7967d793eb86de68d.pdf
    • https://static.usrfiles.com/ugd/d775a9_11674e1b1fa9414096fc539f284f5a60.pdf
    • https://static.usrfiles.com/ugd/48d9a1_9aaea675228244aa9883616b8a5ec410.pdf
    • https://static.usrfiles.com/ugd/10e3af_c616cb78d2754b7fa5fd398028949c7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9977ce3c087b4c299ea0255220b1c1a2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72518400380.pdf
    • https://cdn.shopify.com/s/files/1/0439/2484/8795/files/fojofuzagunuviluxinalav.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/volume_booster_apk_xda.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/pattern_sewing_book.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_off000085c0.bin
5bc00fe34c96a4f4f9e7e5efd978f11073179c6f658ffda402641082fed0a527
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C0 5316 bytes
font_01_sfnt_off000097d9.bin
72414de7cdf5a5ef63563f5f366fe57b7c9adc2b7e96de257466f9c5cf0b3e65
pdf-font-stream PDF embedded font (sfnt) at offset 0x97D9 10256 bytes
font_02_sfnt_off0000baf0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF0 4324 bytes