Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b582d06060ed0f…

MALICIOUS

PDF

39.7 KB Created: 2020-08-11 11:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c068d921dbbf4701aa7731a68a58db58 SHA-1: 2e9f4e5e85cbb17df9a323d246f90c6773c57109 SHA-256: 11b582d06060ed0f8a09d1704810800ba2bc75b7ff794066018f816aaf39bf71
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are algorithmically generated and point to PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.com/pify?keyword=world+currency+symbols+and+names+pdf`. The document body, though heavily obfuscated, contains references to currency symbols and names, likely as a lure. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=world+currency+symbols+and+names+pdf
    • http://puzotod.bridges2learning.net/uploads/1/3/1/6/131606552/finugofaxalewawutegu.pdf
    • http://files.believinginthepower.org/uploads/1/3/0/7/130776166/8fbc70841.pdf
    • http://kubiwomid.partnersinprayerforourprodigals.com/uploads/1/3/2/8/132814930/715471.pdf
    • http://nesojo.dabasocommunityunit.com/uploads/1/3/0/8/130814423/6693229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6090/4604/files/water_temp_san_diego.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/dipizubafede.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1259/files/62922271270.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/2937396979.pdf
    • https://cdn.shopify.com/s/files/1/0440/8888/5413/files/pedezufexekonudukivetobos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suxuteregejo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/item_codes_stardew_valley.pdf
    • https://cdn.shopify.com/s/files/1/0432/0854/0324/files/ejercicios_voz_pasiva_en_presente_simple_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/59407628323.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/96279622486.pdf
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/cidco_lottery_2020_advertisement_download.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_off00005db4.bin
4d83a48a73f45a86927ce8f873b16fa9a639107c593ce85aae954bc7a67470a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 5556 bytes
font_01_sfnt_off0000708c.bin
ad0a0b064b2930b15471b552bb6c4588b104133e00d1ed44986388dc8ed0bd49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 9840 bytes

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