Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acadb2902524197…

MALICIOUS

PDF

48.0 KB Created: 2020-08-30 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35455b7542ee33d740ec50bb2bd3405 SHA-1: 26f1737215006156af9584aa9c7f80280b91d269 SHA-256: 6acadb2902524197206e570527efc0006c84d03671737e755fdf944afd6b2006
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, which in turn leads to a link farm of other PDFs. This suggests an attempt to distribute malicious content or phish users through a chain of redirects. The ML classifier strongly indicated maliciousness, and the PDF structure points to a link-based attack.

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=nordictrack+asr+1000+elliptical+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/804ff6_55684fa1af5b4b1eb1225ef2ca3b578a.pdf
    • https://static.usrfiles.com/ugd/e3c460_0ef0e0ab273342bc83df6a9b7723df77.pdf
    • https://static.usrfiles.com/ugd/b48b60_287b087ee9d042f8aa9a418be76d3c4a.pdf
    • https://static.usrfiles.com/ugd/df4650_40145a60e1754ec4af13d1d7d1b5a430.pdf
    • https://static.usrfiles.com/ugd/1decf9_16acaca351334f6aac58bd95a1ad6da6.pdf
    • https://static.usrfiles.com/ugd/451461_a5ca58e4682a4b40995afe7f0b002d1f.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/12128637996.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/37999927178.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/malunixobovarozuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3471/4017/files/zuzefozefuzalononada.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/dress_shirt_collar_styles_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/63154064521.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d92.bin
8dbac3671dd956e821157baf100a5bea728999356df377577aed56e30406a522
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D92 5128 bytes
font_01_sfnt_off00007f2e.bin
2c29b202e2441aa6c6c7524239520224e1866aca2af3a3d44f98a3f4f766d803
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 10468 bytes
font_02_sfnt_off0000a315.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA315 4324 bytes