Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db8c17e36e3b646…

MALICIOUS

PDF

45.2 KB Created: 2020-07-31 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765f5f42621352c8ef4296f71e165430 SHA-1: bc7b59cf1730ffa57f849718242a42a209c71672 SHA-256: 6db8c17e36e3b646468f2d1fd953a90147c97d14f39f0ab539679db2ac2b06eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a thermostat manual and the malicious URL, suggesting a lure for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

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=comfort+sentry+thermostat+manual
    • http://files.candlesinthedarkness.com/uploads/1/3/0/7/130775025/gonavaviridovepevige.pdf
    • http://files.apaturabeads.com/uploads/1/3/1/4/131410747/bebizujubinas-lizelavo.pdf
    • http://files.girlsstem.ca/uploads/1/3/2/7/132740362/6956714.pdf
    • http://files.jazzymaths.com/uploads/1/3/1/3/131382497/a23d68.pdf
    • http://files.stephaniepercydoula.com/uploads/1/3/0/7/130775635/1474063.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/2518/6466/files/belorovowemulodulobebuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1966/files/15814432415.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/39752047211.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/64008844844.pdf
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/77823598996.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/xizeselela.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/94636810993.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1908/files/kejeresemebexuwirovajaxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/7426/3963/files/63093568811.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/wekutopibonaduxadowovikag.pdf
    • https://cdn.shopify.com/s/files/1/0430/0242/9593/files/39234598441.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5610/files/96124483074.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006571.bin
371c202bafd8dc4da6c66b62c342b7a73324f41be2cedd13395a7bb5e2e630fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 4968 bytes
font_01_sfnt_off0000762d.bin
40d39f1c799c34a619e658a0aca2a2e421d34ed533a8dc60767978e870ebf94e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762D 10384 bytes
font_02_sfnt_off0000998c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998C 4324 bytes

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