Malicious PDF — malware analysis report

Static analysis result for SHA-256 72168865793d43ea…

MALICIOUS

PDF

34.0 KB Created: 2020-08-15 02:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7519ff325fb88118ae2110ca9aead61b SHA-1: 4b3649497c89503e9305bb1a819e3991e49c4719 SHA-256: 72168865793d43ea9f13601c3b15df5a8486428fb1f88a900f1d643788df97aa
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cute baby funny images' and a URL that appears to be part of a link farm or SEO manipulation scheme. The presence of multiple external links, including one pointing to malicious infrastructure, suggests an attempt to redirect users to harmful content or exploit them through a link farm.

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=cute+baby+funny+images
    • http://files.florencetrackclub.com/uploads/1/3/0/8/130814340/08a821e62e79b.pdf
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdf
    • http://files.quiltsbyj.com/uploads/1/3/1/6/131636916/gapas_nimosakiwekejur_dabomafesam.pdf
    • http://files.vintagewoodworkingtools.net/uploads/1/3/0/7/130739204/8115170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/xogidaxaxogipinule.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/kajadisetolifom.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/domiwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/10171677533.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/50480920819.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/opposite_words_in_english_for_class_1_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/bazubimiwenovodevafawusif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7409/files/52746494767.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/panchang_calendar_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/express_vpn_ip.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_off000049df.bin
91c8805227be3cebc3d3f0f1f9d1ce940b1623ac60b8d3b3b1eb5a4bbd2edab3
pdf-font-stream PDF embedded font (sfnt) at offset 0x49DF 5108 bytes
font_01_sfnt_off00005b41.bin
c7bea70bb5b7564f227d87dd2429092273143fbfb9a3758ca1c0cf35950e42a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B41 9484 bytes