Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e7730d42f9e9d0…

MALICIOUS

PDF

50.6 KB Created: 2020-08-02 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f82b0518d8ce432c1c848a39e3a2ce SHA-1: a9e605a3164252a9dccc69a50f7194bc8c7c32a7 SHA-256: 15e7730d42f9e9d0e4f1ee5b2357739c3ded1b61eddb25b1b67c19ad81ce3909
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=what+is+the+abbreviation+for+missouri, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this 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=what+is+the+abbreviation+for+missouri
    • http://rezure.exilesbazaar.com/uploads/1/3/1/6/131637136/deradaxex.pdf
    • http://files.heidysbox.com/uploads/1/3/1/4/131409574/93900e8c1dfb263.pdf
    • http://files.morabezacatering.com/uploads/1/3/0/8/130814397/9768201.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/xisilipem.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/rirekizawurosegakibodo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9698/0136/files/75485003894.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/labikosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/wodujuwowiweb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/tamurak.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/86653958352.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/fujodaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/69764728418.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/meniwiwovasijovutivid.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/karaparumujawajan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/nonasoregonibogilewijaxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/navefixunip.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_off00007e97.bin
b883a8ee4f0ce6b73e712385f19cd6cd164de5f6dda91562657a135b7d987cf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 5188 bytes
font_01_sfnt_off00009024.bin
673bb7208f60a96604cbc90ed66635639086523fb8007991d58b4fc4f9977cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x9024 14524 bytes