Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f3e439b9374163…

MALICIOUS

PDF

38.0 KB Created: 2020-09-03 01:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0866472b88e6ea8ef2a526885b1cb112 SHA-1: 2e34841c282509953d57a20922502112a29f2a6f SHA-256: 98f3e439b937416319d5d3146aba6f3557c86062faaa30e956f35d87a7287cab
152 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.link, disguised as a "gmetrix word test 3 answers" document. This suggests a phishing or malware distribution attempt. The document also contains a large number of embedded links to various PDF files, indicating a link farm designed to manipulate search engine results or distribute content. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate a malicious intent.

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.link/wix?keyword=gmetrix+word+test+3+answers
    • https://static.usrfiles.com/ugd/9ff9b8_a962b74257a6487fb8a598e6904336b0.pdf
    • https://static.usrfiles.com/ugd/17beed_c7a3ccb8a7be47e19dd069c1d0de873c.pdf
    • https://static.usrfiles.com/ugd/bf650e_7e22afbafb2c4550820f0ed7d17fdd41.pdf
    • https://static.usrfiles.com/ugd/b56239_dd2ceff34cd24da4b39c95b3540d3cbf.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/visual_basic._net_datagridview.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/easy_percussion_ensemble_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/xonadotupasum.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/kiparofinamuvuxo.pdf
    • https://static.usrfiles.com/ugd/5a1791_9f991fe55dc4417297565ec115595ba5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_246f58610c4342db92923d27d671ccfc.pdf
    • https://static.usrfiles.com/ugd/8a419d_75a738dba27449b4aae2130590661d05.pdf
    • https://static.usrfiles.com/ugd/ab922d_fcef069b312d4ccba3809654a1aa6277.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_off0000452f.bin
1a72cbbd944420f9989c7ae3f0225da1c2a8a1a8693c90a707c2cee0f82e8db9
pdf-font-stream PDF embedded font (sfnt) at offset 0x452F 5296 bytes
font_01_sfnt_off00005724.bin
98c20b23f7b13b93cf89252c37f0c4f1a83cb88982bb46047c69652252b7bc67
pdf-font-stream PDF embedded font (sfnt) at offset 0x5724 7016 bytes
font_02_sfnt_off00006a03.bin
c425d26cb12918f61172b9fbf30e1d6a30bfb8c642c279959732ea2c231f497a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A03 9632 bytes