Malicious PDF — malware analysis report

Static analysis result for SHA-256 7823d07729b205c4…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 14:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38076e7e9ac887186a37ac11fae303d9 SHA-1: d5c6cedd96c60baaaa1b83569285b23c499e07a6 SHA-256: 7823d07729b205c4b699923293069a202d9f4634f15ed075a826bd54d5c431a3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or SEO abuse for malicious purposes. The primary link leads to a redirector that appears to be part of a malicious infrastructure, likely intended to lead users to download unwanted software or further malicious content. The ML classifier also strongly indicated maliciousness.

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=pdf+file+merger+offline+free+download
    • http://files.millerptorlando.com/uploads/1/3/0/8/130874257/redefifiguweve_jelajenor.pdf
    • http://files.bigpineschools.org/uploads/1/3/0/9/130969061/1399196.pdf
    • http://files.iconiacapital.com/uploads/1/3/1/3/131382982/xadojabok.pdf
    • http://files.cbettientertainment.com/uploads/1/3/2/3/132302787/1498366.pdf
    • http://files.barbaralcreations.com/uploads/1/3/0/9/130969440/3442b7d1d19a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/17522385531.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8639/files/kewobamelobipujolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/joxudokirenofanesuwunaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/mofesemigezuvedaripezan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/27590830609.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/mobo_market_apk_downloader.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/25246655579.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/39720842566.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/25548477658.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/89757024797.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_off00006fb8.bin
6b5f045798e7bb4a0b6469a68e57ee83d48a395f1ef3267a6bcf404c872c8d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 5144 bytes
font_01_sfnt_off0000812f.bin
56b63f52e415bc7edb8b607adbf762c4eef56ca769d4f555627c3fb40df50f5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x812F 10716 bytes