Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfd8cb994370871…

MALICIOUS

PDF

39.4 KB Created: 2020-08-04 03:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5e3bd884effb0272a6a566df42396fc SHA-1: 699b0826cb5473b189e5c5d5db8488979d7e026a SHA-256: 7bfd8cb99437087177e2bd8a4b74c924cee8451697521afaf69be966dbfdc592
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=5+stages+grief+pdf
    • http://files.beautykittytrainingacademy.com/uploads/1/3/1/3/131380308/wuruwumugilo.pdf
    • http://files.our-perspective.com/uploads/1/3/0/8/130814101/3631544.pdf
    • http://files.meilensteinwein.ch/uploads/1/3/0/7/130775537/3114971.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/forimiximezalisepok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/47280169771.pdf
    • https://cdn.shopify.com/s/files/1/0434/0908/0477/files/kapirexisupitudajorawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/dutij.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/72783110845.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/tafoxojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/39360715429.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/automotive_mechanics_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/77132524120.pdf
    • https://cdn.shopify.com/s/files/1/0434/0783/5303/files/wuzibopubonu.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_off00005deb.bin
cf0c113dec3ea1e5b1c1bd14a01d0d0ef68dbc1ede987ce562eab7599053672e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEB 5204 bytes
font_01_sfnt_off00006fad.bin
da96a10f177a3635d1efbf9c5f2e70a9b06f3fa1d5612c2d51abddc1f0454d43
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAD 9852 bytes