Malicious PDF — malware analysis report

Static analysis result for SHA-256 757c13801f16359b…

MALICIOUS

PDF

45.0 KB Created: 2020-08-15 23:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35fc6d8765c893056d359bddd4d03d95 SHA-1: 67b7804f2317c97f7a38f2a393df17168d999a66 SHA-256: 757c13801f16359bef39996ed069ffd1139ccb2c1e4963ebfd053a697a59db29
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a guide to viewing electronic invoices. The document also features a large number of SEO-optimized PDF links, many hosted on Shopify, which is a common tactic for link farms and potentially distributing malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.com/wb?keyword=como%20visualizar%20nota%20fiscal%20eletronica%20em%20pdf
    • http://xiwiwure.middletonreview.com/uploads/1/3/0/7/130739615/3746121.pdf
    • http://files.oraclefitness.com/uploads/1/3/0/7/130739826/887303.pdf
    • http://files.teamsterslocal896.org/uploads/1/3/0/7/130738805/b942055f543e.pdf
    • http://files.msubpnp.com/uploads/1/3/0/8/130813796/9285059.pdf
    • http://zepar.richmondhillnaturopath.com/uploads/1/3/1/3/131383483/gajowikope-ganuzi-vibeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/nakshatra_astrology_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/lesofewimamejozux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78992801071.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/47020766674.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/bel_canto_technique.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/probability_and_statistics_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/27672097120.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/90622902040.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/red_chinchompa_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/adobe_reader_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0426/3580/files/32325453994.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4940/files/ripuburokok.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ffa.bin
e867acb4579ca7dff18e55dc2f75ca99562d74f042618f354c5d7dbe83aff15c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFA 5316 bytes
font_01_sfnt_off00007206.bin
1b211027a24287a6ae1bb1492d987f6c783847feedddec1c0c0538260fc6a9cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7206 11356 bytes
font_02_sfnt_off00009702.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9702 4324 bytes

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