Malicious PDF — malware analysis report

Static analysis result for SHA-256 629a84910a45b804…

MALICIOUS

PDF

47.5 KB Created: 2020-08-19 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22d1591da66228b364da6872f9924bb4 SHA-1: f770460ad84a64d1e3f14b671846a8d8109cdeba SHA-256: 629a84910a45b8048aa6bfc3772e6705a6396ec3d9a6ae4732ec6a6f842f08b1
154 Risk Score

Malware Insights

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

The PDF document was flagged for containing a large number of external links, with one link pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to either manipulate search results or distribute further malicious content, potentially via the redirector.

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=famille+nombreuse+reportage+soukdavone
    • http://jaxare.sevenstarsamerica.org/uploads/1/3/1/3/131398504/tipajubufivapu.pdf
    • http://files.thriveswpa.org/uploads/1/3/1/4/131407823/fewakuleroner_vodukek.pdf
    • http://joxonid.byptrampolines.com/uploads/1/3/1/3/131379730/6427354.pdf
    • http://files.bscottart.com/uploads/1/3/1/8/131857419/c2a5786be0ab6ee.pdf
    • http://sugej.fortlincoln.org/uploads/1/3/1/8/131871745/e886233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/agile_mind_algebra_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0454/2945/7064/files/50007108679.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6422/files/9488553740.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/44534225050.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0071/files/45534794262.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/dobojerixovanew.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9863/files/tumof.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/63424896031.pdf
    • https://cdn.shopify.com/s/files/1/0435/7393/6291/files/cctv_camera_dvr_installation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006102.bin
f00bd923228d0d669b048ea8c17e7158a2c69994f194e9dccf2013f5422a8e2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6102 5496 bytes
font_01_sfnt_off00007394.bin
24087b7aa2eca4755500bf2be5acad30f45b7b36e0a68dba9ee06e652db0551e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 5284 bytes
font_02_sfnt_off0000868e.bin
a152dd7127025309ff0476c5bd755d888a4de7b9738a22f1c25d50a4469d6033
pdf-font-stream PDF embedded font (sfnt) at offset 0x868E 12840 bytes