Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f357b5d09c2d8ed…

MALICIOUS

PDF

40.2 KB Created: 2020-08-03 22:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360ce2804c5f7b76a29530cc646fb43a SHA-1: e4e400cf3ed3b62361fe7e332b8cd833583472f9 SHA-256: 0f357b5d09c2d8ed5ae0528a99dbae0a542bd853ab626de23b0f99691f0f73c2
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 flagged this PDF with high confidence. The primary attack pattern appears to be directing users to external malicious sites, potentially for phishing or to host further malware. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

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=pemeriksaan+sediaan+apus+darah+tepi+pdf
    • http://files.kengallucciocup.com/uploads/1/3/0/9/130969761/tesawo.pdf
    • http://files.barryboyce.com/uploads/1/3/0/7/130740512/d3866.pdf
    • http://files.elshaddaiintl.com/uploads/1/3/0/7/130776200/rikedutabizinejava.pdf
    • http://files.wilsonhypnotherapy.com/uploads/1/3/1/0/131070230/76bde89cc2c9e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7684/4694/files/sukajatasaliroz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/dejefaluwuribom.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/fenekugodimakafekakavu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/63822654568.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/45343527675.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/rovifiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/60854379716.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9309/files/vovojujowopa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dilos.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/72166658986.pdf
    • https://cdn.shopify.com/s/files/1/0439/8520/7454/files/xewegetije.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/62315431572.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_off00006084.bin
b8ff32dfaa7bf51c145ae0ec73c1ea194ff4ef2765981357c87f6ce9d9dc42fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6084 5312 bytes
font_01_sfnt_off00007269.bin
b309cb5e6828c527cdbc3093641f2e731133a8ab5331940bc0540a695219cb36
pdf-font-stream PDF embedded font (sfnt) at offset 0x7269 9732 bytes