Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f533b4529a0708c…

MALICIOUS

PDF

46.8 KB Created: 2020-07-26 21:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 909c9cf8bb3f80e3b6b56fa4a667af4f SHA-1: e82917c3483b4c86ebaaf08f2c7314fc22c167ee SHA-256: 5f533b4529a0708c22ae37233846cfb4b116e747086f349ab049cfb6c668588d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

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/pify?keyword=carbonic+acid+formation+from+co2
    • http://files.floatingtheboat.co.uk/uploads/1/3/0/7/130740412/9fe1dc5.pdf
    • http://files.dawnmoniquewilliams.com/uploads/1/3/1/3/131379748/c6869.pdf
    • http://files.parismotel.co.uk/uploads/1/3/1/4/131452929/melab_gexipumaxot_loxovolipakid.pdf
    • http://files.ribbonbowsandmore.com/uploads/1/3/0/8/130874189/walib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/91517980004.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/73913067840.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/60712182883.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/devasajusefojiwexetem.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/xujakiviwegopilis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/gelukajemiridaxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/38408780790.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/55048767901.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9571/files/debonexanorano.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/jitidonanelavusopuvog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/90922453593.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_off00007a3f.bin
b5ffb5dc53c8645d2c4c73e16448fccfbbbe42db387301403be41d701acaa949
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3F 4920 bytes
font_01_sfnt_off00008add.bin
d34f8c4489193c660e55ed558b2140029ab00f91369ee463f7a7b341329ce5a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADD 10304 bytes