Malicious PDF — malware analysis report

Static analysis result for SHA-256 f357ea1e77ff5990…

MALICIOUS

PDF

45.4 KB Created: 2020-08-15 11:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bb6b62b84603d518011af20bb2ac46 SHA-1: 9d6b3344bd858623d77353e3bb64d4a011084257 SHA-256: f357ea1e77ff59909ffb84a08b60a5419312e5965aebf3159fa0540d7b71dc87
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link pointing to 'ttraff.com'. Another critical heuristic flags it as a PDF SEO link farm, with many links pointing to Shopify-hosted PDFs. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated, but the presence of the 'ttraff.com' URL within the body text and the embedded link structure suggests a lure to a malicious site, likely for further exploitation or phishing.

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/wb?keyword=simple%20future%20tense%20grammar%20pdf
    • http://files.coming-outofthedark.com/uploads/1/3/0/8/130813899/1654059.pdf
    • http://files.insulators41.com/uploads/1/3/0/7/130740166/747528d.pdf
    • http://files.twttoa.com/uploads/1/3/0/9/130969497/tuwolibesab.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/rozutuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/get_input_from_user_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/sapejodesoroxaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/gijupofalorosapasa.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/12106715738.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/lebezadukunopepimife.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/binosogenasigafumotuzarij.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/avanceon_limited_annual_report_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7173/files/64247376157.pdf
    • https://cdn.shopify.com/s/files/1/0428/9206/6975/files/gibatatefogeleradebivetiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/35119242163.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/navbharat_newspaper_raipur_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007258.bin
417d95efa3e9b862dda2eaa4a30ba3c706444676afa8de6da303eab4d0b5c109
pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 5464 bytes
font_01_sfnt_off000084c9.bin
56e0e247a92eda7bd41e5e4cf7d8fc5eaa692d0c2228e7e01f639084d40752e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 10844 bytes