Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a8a9f074694ca…

MALICIOUS

PDF

41.0 KB Created: 2020-08-24 14:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091052aa8ae28d6b47d614f86c3d16c0 SHA-1: 42628708220e7d5baee66b21ac5d2b8050c4c45d SHA-256: 659a8a9f074694ca8e82bd5e425e66c0b58c301064b83d834e3c76a84052cedf
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.com, which is likely used to obscure the final destination of the malicious content. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution.

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/pify?keyword=australian+curriculum+assessment+and+reporting+authority+2016
    • http://nilefuxu.raharmonyasianmedicine.com/uploads/1/3/1/3/131398444/e67e2a69356.pdf
    • http://dibidumow.pivotal-step.com/uploads/1/3/0/7/130739140/putesenuk_latis_gegikajolomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/vuzulakoligumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6467/0873/files/sezedoboperugenuvine.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/gusubepasimubinej.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/16179450065.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/9554351389.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/gajavav.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6914/files/gilekigij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/cancer_de_colon_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/4963/9327/files/gakofuzidipefu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3694/9152/files/78139711799.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/bls_provider_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/5758561587.pdf
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/74162997460.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_off000053e2.bin
991e1e44c15dad5df0898d0d9bf5bcba49c651bf0001e7ad05c96e349ddbb0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E2 5940 bytes
font_01_sfnt_off000067ee.bin
f3490328af9c2f7e5fc6c0735cab8721fac7add1b0f1d7d1ef6808549b057821		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67EE 9540 bytes
font_02_sfnt_off0000888c.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888C 4324 bytes

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