Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a05bbbb160d00d…

MALICIOUS

PDF

33.6 KB Created: 2020-08-04 04:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62de2a87ef5593aa99317b35d3fd5ba SHA-1: 610560d309aa6e267e132bd7ee0ba54345e74cd8 SHA-256: 75a05bbbb160d00d648b12c3166119734f4456e3fc7078f2854dd3eb36896317
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 the primary links, 'https://ttraff.ru/pify?keyword=imperative+verbs+worksheet+pdf', is flagged as a malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the 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.ru/pify?keyword=imperative+verbs+worksheet+pdf
    • http://files.lightandshinedesigns.com/uploads/1/3/0/8/130874038/4750522.pdf
    • http://files.andyjohnsonpsychlab.com/uploads/1/3/1/8/131871494/8961320.pdf
    • http://files.merlotembargo.com/uploads/1/3/1/8/131872015/2592258.pdf
    • http://files.nadermakki.com/uploads/1/3/1/4/131452824/6c089afb5.pdf
    • http://files.janpeterdegraaff.com/uploads/1/3/2/6/132683017/rozekerise_mudafabunonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/dofetafuwipato.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1357/files/84666431334.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/56438862077.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/16331014185.pdf
    • https://cdn.shopify.com/s/files/1/0433/1477/4169/files/19271119716.pdf
    • https://cdn.shopify.com/s/files/1/0437/0238/6856/files/12051390081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zemivok.pdf
    • https://cdn.shopify.com/s/files/1/0432/0064/3236/files/15165396991.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/94209017638.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/mavutekufobuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/paparoxokurifeginenu.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_off00004800.bin
af03db5094293bbb165ed87a239646137a5dd5c38207c6822cf4f0face9a453c
pdf-font-stream PDF embedded font (sfnt) at offset 0x4800 5544 bytes
font_01_sfnt_off00005abb.bin
71fb2bd142a7acddacae81a788dee85c2b521cc89f5f8a1eaa04e49a280aec70
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABB 9068 bytes