Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd6684035a49af0…

MALICIOUS

PDF

66.3 KB Created: 2020-08-23 01:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d59ab41cc60dd52f0df5fa8317342285 SHA-1: 73d2e7b03efd5980cf4eff3c16d7db0d61659ba2 SHA-256: 6fd6684035a49af0dc0e9e1bec6c6826923d72798c6146e63ba2caecde04518e
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is an exam answer key, a common lure for phishing or malware delivery. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tnpsc+assistant+jailor+exam+answer+key+2019
    • http://files.bodybrainexercise.com/uploads/1/3/2/7/132710783/xovanofusibolutar.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/goxagewesitavonub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/borakipij.pdf
    • https://cdn.shopify.com/s/files/1/0449/6978/7560/files/microsoft_bluetooth_mouse_5000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0463/0020/1117/files/blackwater_river_florida_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/4958/1730/files/21573021200.pdf
    • https://cdn.shopify.com/s/files/1/0430/5128/6690/files/buxuvarudedowitugusiti.pdf
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/xizefewebilavibaxanaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/74962769933.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5637/files/gourmet_race_sheet_music_viola.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
stream_005_off0000b0ee.bin
b310aa33b2e830d9b823386e85735c9cde2be2273f91eda70c70490affe3baac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB0EE 8936 bytes
font_00_sfnt_off00009ccb.bin
6eddf4b09980031a400b8d3545d7b21913551a0b52ad9335cd3c67ff16d02dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCB 5912 bytes
font_02_sfnt_off0000ca18.bin
d822baa931d66031aab5732ad1e356bec609a0c0e18fab0ca5f04fcceabac3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16292 bytes

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