Malicious PDF — malware analysis report

Static analysis result for SHA-256 681dc8d602afda11…

MALICIOUS

PDF

39.1 KB Created: 2020-08-10 22:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326cd3345fa3f5a81e13515c013040cc SHA-1: 8cf2d7a3d8a0c886f62558a0a57c19eec5ac3374 SHA-256: 681dc8d602afda11793758a8121d5cfe475e44ab3bacd9a52fa4f49aa2cc5411
194 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to 'merge pdf logiciel' and includes URLs that appear to be part of a link farm designed to host or redirect to other PDF files. The presence of these links and the ML classifier firing strongly suggest a phishing or malware distribution attempt.

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=merge+pdf+logiciel
    • http://zumefof.alaskacdc.org/uploads/1/3/1/0/131070722/1335369.pdf
    • http://files.greenmeadowsbaptistchurch.com/uploads/1/3/0/8/130814258/1127575.pdf
    • http://files.nanaimobuddhistmeditationgroup.org/uploads/1/3/1/4/131453543/fisonoba_wesosagemesiduz_felilefu.pdf
    • http://files.hawthornhillsranch.com/uploads/1/3/0/9/130969818/a10e953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0703/2990/files/xanar.pdf
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/15644422885.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/53497856626.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99640144283.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/psychology_facts_about_emotions.pdf
    • https://cdn.shopify.com/s/files/1/0445/5740/2276/files/5088553654.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/91417869197.pdf
    • https://cdn.shopify.com/s/files/1/0446/7530/1539/files/pct_applicant_s_guide_national_phase.pdf
    • https://cdn.shopify.com/s/files/1/0429/6297/6921/files/57450379243.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_off00005bca.bin
e7a4c56c8a78fdb114b26af0e74c56c41b46ef81225a0847e70daefd6ab10eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCA 4940 bytes
font_01_sfnt_off00006caf.bin
de96511b77020a2ac9a322039cb67464aa27439e19b3f369d82849cadb36405a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAF 10380 bytes

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