Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1499ab23179156…

MALICIOUS

PDF

38.5 KB Created: 2020-08-25 17:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e67d01447f952dcf9e4c447285533ba1 SHA-1: 2996275cd431deca6f25ac546af12f29cfc34280 SHA-256: 9c1499ab2317915606999f857a284709257dad81585512f2b4e9641a181a54b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.ru', suggesting a phishing or malware distribution lure. The document body text, though heavily obfuscated, contains keywords like 'Bhoomi song bestwap' and references to wkhtmltopdf, indicating an attempt to disguise the malicious intent as a song download. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

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=bhoomi+song++bestwap
    • http://files.sm4g.net/uploads/1/3/1/4/131438071/pujematetuvamadot.pdf
    • http://kemejebox.caryncarlone.com/uploads/1/3/1/4/131437987/vutewaku_zadegepis_dadibot.pdf
    • http://files.capripta.com/uploads/1/3/0/9/130969717/zadizulupozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/vipusopakiputipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/vunevevenopinisibobofa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/pemobar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/zewapuloledigigamavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/manual_accounting_system_vs_computerized_accounting_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/8522/6393/files/salawijev.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/xotetaxedojibigavipuworeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/difference_between_parametric_and_nonparametric_statistical_tests.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/89523482805.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5419/files/36425804487.pdf
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/luzamev.pdf
    • https://cdn.shopify.com/s/files/1/0429/1103/9655/files/zamigubetebo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/blockchain_beyond_bitcoin.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_off00004b0b.bin
e74c1745ce66b794d1cf616d41d293cdddfd0ab7f61821cffaedf933f6fce1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B0B 5176 bytes
font_01_sfnt_off00005c92.bin
8906247fcfd8533d71cd5ebbb23358f78b89143005aecbb6496e66f804c4e48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C92 10168 bytes
font_02_sfnt_off00007f26.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F26 4324 bytes

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