Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68782858ffc048…

MALICIOUS

PDF

45.2 KB Created: 2020-08-08 00:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 089799acfaa4206cb2535f31f357a09f SHA-1: c1494260c3c7275882729f06aa3a39c8f6d7e6b4 SHA-256: ef68782858ffc0485676b47070297dfbff723ec26330b5503a50af7570c7d83d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. This URL is part of a link farm designed to distribute further malicious PDFs. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, likely used to mask the malicious activity. 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.com/pify?keyword=descargar+certificado+de+antecedentes+judiciales+policia+nacional+pdf
    • http://files.heidisaario.com/uploads/1/3/0/8/130814208/biromefusavajitukak.pdf
    • http://dikir.croberts100.com/uploads/1/3/0/7/130739678/zujabut.pdf
    • http://files.niagaracountycsd.net/uploads/1/3/0/8/130814921/4893805.pdf
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/pubifupipadimunugogadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/arquitectura_latinoamericana_contemporanea.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/rohatgi_an_introduction_to_probability_theory_and_mathematical_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0443/0639/9388/files/benzodiazepine_withdrawal_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/tadawajab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8019/files/favuvux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8402105605.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/pefezekexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5934/files/learning_disabilities_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0449/6615/0303/files/axis_cube_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0430/4004/7253/files/char_tolowercase_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/41758213793.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_off0000672f.bin
bc95957a17d7f5308581b7deca557f35e2ebc2f33fdc36fa4552c6ca0790be53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672F 5400 bytes
font_01_sfnt_off000079a0.bin
13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A0 2092 bytes
font_02_sfnt_off00008345.bin
35d52065726963001fc76b53ff3150278e6b6554883b025e1a7d3b87263cb508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8345 10972 bytes

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