Malicious PDF — malware analysis report

Static analysis result for SHA-256 13570c73874d5433…

MALICIOUS

PDF

40.4 KB Created: 2020-08-23 02:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c01ee1f4a3d8624d0e3f791bc56cb26 SHA-1: 2a7b015730419c8adcf0824f337812374491123a SHA-256: 13570c73874d5433be3d43728e1c1196b1194ee51eeede4c9abf3346c8f610b4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector and a large farm of PDF links, suggesting a phishing or spam campaign. The ML classifier strongly indicated maliciousness, and the document body text, though garbled, contains a URL that aligns with the heuristic findings. No scripts were extracted, but the presence of numerous links points to an attempt to drive traffic to malicious or spam content.

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.cc/pify?keyword=virtual+answering+service+canada
    • http://lusabu.wavebeheard.com/uploads/1/3/1/4/131409090/xeduvu.pdf
    • http://files.leapingllamas.com/uploads/1/3/2/3/132303337/4868565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/xisamuvaperotesukan.pdf
    • https://cdn.shopify.com/s/files/1/0465/1882/9206/files/10876518818.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/sojujarogigivaxap.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/kapulomiparewiloranosebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/37620813549.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/fubed.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/palimpsest_catherynne_m_valente.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/22653457701.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/38864692894.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/pobemewa.pdf
    • https://cdn.shopify.com/s/files/1/0450/6717/4040/files/tanzania_protected_areas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8460/files/98679481685.pdf
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/duzugevofafivadu.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_off00005efe.bin
df391d42fb06a00e000a8404a0c57a3b97125120b6a2ea2d4693706afe8ea5be
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFE 5224 bytes
font_01_sfnt_off000070e1.bin
35724dcaafd2a5057e7ad038bff276f9d48845693106085b9c50100bb2ef7d50
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E1 10608 bytes