Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2cfe7ba07fc073…

MALICIOUS

PDF

51.8 KB Created: 2020-08-20 08:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8951469401f2ab30c19cff0153965ff SHA-1: 522793db3329ae1f8c61abd392fee6e64b70965b SHA-256: 6b2cfe7ba07fc07321eb40ebd3e3c971b12377d5e192e9f8f5caafd2c5fc343c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims to malicious sites, potentially for phishing or malware distribution.

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=ms+word+process+documentation+template
    • http://files.myspeechdebate.com/uploads/1/3/1/6/131607054/e4fc2946bb.pdf
    • http://wetoluki.imagecinemas.com/uploads/1/3/1/3/131383314/biwijefoxu_sasox_nerugo.pdf
    • http://rufepovaf.flexosc.com/uploads/1/3/1/6/131606490/molit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9116/9185/files/fetov.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/57754851276.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/kafoxukimosil.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3086/files/dimensional_shapes_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/la_cercle_trigonometrique.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7793/files/94940688445.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/49914924996.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/robewesulutaguxidebano.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/10914242110.pdf
    • https://cdn.shopify.com/s/files/1/0441/1850/7672/files/college_algebra_practice.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/bixorijokar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/geely_automobile_holdings_ltd_annual_report_2016.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_off00008d82.bin
8605fe6b84d7d7385648d39d225f52410fa38615cf9dcd1ae21f83fa6e83ab63
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D82 5316 bytes
font_01_sfnt_off00009f93.bin
21366473a36d575ac4698e3bcbad096eab516b637fa6af778e1d7496ac33e825
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F93 10112 bytes