Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff64250ef7e0a0a…

MALICIOUS

PDF

111.1 KB Created: 2020-08-31 00:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d2a157362dd869ad51a6940ee957912 SHA-1: 42d0f8d922c79cbdf51dae7c6e1f5bf477a0069b SHA-256: 6ff64250ef7e0a0a8971b8467334a28652819a0805a1ee1d951c805550012731
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one prominent URL leading to a redirector service. This suggests an attempt to direct users to malicious content or phishing pages, likely disguised as a search result for 'Ac delco battery serial number lookup'. The ML classifier strongly indicates malicious intent, and the presence of many external links points towards a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/wix?keyword=ac+delco+battery+serial+number+lookup
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e7e0b3ce968343c2bab98d79d3275bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/1a89c8_93db8b12f8dc4dd38594a6ea37e8b240.pdf
    • https://static.usrfiles.com/ugd/b8c837_368acbcc35ed4116b2c9c9ddc8986b48.pdf
    • https://static.usrfiles.com/ugd/b8c837_771bd48058614aebab9436fb5aa7caeb.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_1baa9d91b28f45b7a645c1012a306540.pdf
    • https://static.usrfiles.com/ugd/badafb_711c2bf60fc9409ba2ac075ea8bc9e4d.pdf
    • https://static.usrfiles.com/ugd/55f640_07d4354e52614eb4a7cc75b41f5bb34f.pdf
    • https://static.usrfiles.com/ugd/7f929b_9494c9b3e5914119860d77e2ddf93803.pdf
    • https://cdn.shopify.com/s/files/1/0464/7242/9718/files/71160802586.pdf
    • https://cdn.shopify.com/s/files/1/0463/3486/9661/files/impulse_control_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/jinisikiduwarusitija.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/acknowledgement_of_paternity_texas.pdf
    • https://cdn.shopify.com/s/files/1/0437/3214/0186/files/savogovigerewo.pdf
    • https://cdn.shopify.com/s/files/1/0457/5831/6700/files/niluf.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/jatotim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/jafusofoxuxeralal.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/86778759126.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00018aa9.bin
38383c0aa08e66b08dc597e8cd9c649be52f8ec2b9305b59d1c7324b99db4a8f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18AA9 20900 bytes
font_00_sfnt_off0001422f.bin
77f1b05547554a96a18f603c1ac4ac2373455af4d65f805bbaa4174ff8555267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1422F 4232 bytes
font_01_sfnt_off0001511a.bin
f1539cb62a862152ba1217c7546a0c8c0f8c9d5b80acb7c0b224b1edf606efe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1511A 5512 bytes
font_02_sfnt_off000163b2.bin
0f4f96f984dce8f17c1da2bfb7bad65b068abc3b4cdcf8772c892d5512479a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163B2 11360 bytes

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