Malicious PDF — malware analysis report

Static analysis result for SHA-256 69bff0b1c9791840…

MALICIOUS

PDF

34.5 KB Created: 2020-08-31 04:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0663ab92cf985a8a203bc1287b41aa3b SHA-1: 599cc63871dd8f031aaf3105d5718915bb27af03 SHA-256: 69bff0b1c9791840cd02261b5f30ab0c9af19aea3f56f2ea4977b906473fd4e8
154 Risk Score

Malware Insights

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

The PDF contains a link farm with a primary malicious redirector URL, disguised as an Amazon purchase confirmation. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the document body and heuristics point to a social engineering lure.

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=amazon+purchase+pin
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cc14e4_16695442c0194be0875f659e18450f32.pdf
    • https://static.usrfiles.com/ugd/ad2ade_6cc7b3dcfb8f4121aca2fa5511007f18.pdf
    • https://static.usrfiles.com/ugd/bf650e_41453987e4364036a8fbb5ce3a094892.pdf
    • https://static.usrfiles.com/ugd/b42fd6_6d82978c5e4e4b4e99ddfc86fb6aee6d.pdf
    • https://static.usrfiles.com/ugd/f65518_3729186a808d4a1d87f601f7b50be031.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_7ff8ede2e4bc4978bb989fa341356c0b.pdf
    • https://static.usrfiles.com/ugd/599026_aa947972605848138d5c25092374404d.pdf
    • https://static.usrfiles.com/ugd/e02969_6046ad1c93c34d409031294c114f6ae8.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_1710deb218be4b1389a254ec65b03f0e.pdf
    • https://static.usrfiles.com/ugd/a771bd_7074c162ba0e461f913b754834b69c6b.pdf
    • https://static.usrfiles.com/ugd/a91264_5ae2ed898350423da84bf1498e434285.pdf
    • https://static.usrfiles.com/ugd/e5a943_f8a1512b9dc8497280dad46d672e87bb.pdf
    • https://static.usrfiles.com/ugd/6f9b04_5a36be9510c643b984f258897cedda2a.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_ad91be518d384594916b40dd33ecb5da.pdf
    • https://static.usrfiles.com/ugd/003b86_2bd1af37237a4f13a3c2b13537c49095.pdf
    • https://static.usrfiles.com/ugd/b910ae_4c3fb3e199274c1b9b407028e7f24e34.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a50.bin
f35acdf224fbd93c1bcbee6a7a4014134dc3c7458982840b266c8bae48ea572f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A50 5180 bytes
font_01_sfnt_off00005bbe.bin
bc7ff772bf930878c2edd3d78e3e24cf6118d52a5999ecce9471dd3e59c13d24
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBE 9820 bytes