Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d341f0b071cbec…

MALICIOUS

PDF

40.1 KB Created: 2020-09-02 04:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c88e55eb3c01aebeec90e21c053771a SHA-1: 732d251ea9cf175800548dbcce6fb2609be68e8b SHA-256: 64d341f0b071cbec72cbbf0bb99bdc14b0e697a458a7db36993faf65784c0c54
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is disguised as a free music instrumental. This suggests a phishing or scam attempt to redirect users to malicious content. The PDF also contains a large number of external links, many of which point to benign files, but the primary malicious link is clear. No scripts were extracted, but the presence of embedded URLs and the malicious redirector 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=free+afrobeat+instrumental++2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/8c0e65_10fef7276053429bbc547b16e3f4aecb.pdf
    • https://static.usrfiles.com/ugd/6cf392_79e70795da344df2b07dcf1933977c40.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cb3d912147b4bcf965305c13a1a36b4.pdf
    • https://static.usrfiles.com/ugd/48d9a1_214549fb738b429db293b70c23b64f4f.pdf
    • https://cdn.shopify.com/s/files/1/0439/9002/4350/files/30923515570.pdf
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/elementary_lesson_plan_template_editable.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/chicago_benny_goodman_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0452/4684/0994/files/esterification_of_carboxylic_acid.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/asian_organized_crime.pdf
    • https://static.usrfiles.com/ugd/b8c837_83384829fd414361a6b8c7de3dc7fae0.pdf
    • https://static.usrfiles.com/ugd/38eac1_1cb4c5c156d74159abfda567888aa4a9.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_off00005d22.bin
e23ca69ccc3caea0b10bffa18c8b6fb38cc6beeb68b1934711678a4d2a71dfa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 5528 bytes
font_01_sfnt_off00006fd7.bin
57f31b1f36067038103791c06ef28d43e6396b90332058f4b90b67f5271461ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 10592 bytes