Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c441766765b382…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 14:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db92b597553b26e2a73339794e4be8b SHA-1: e5fa0d5c18bbe4d6c40857ba8689d69b9b387d13 SHA-256: 70c441766765b382b18abbea64f6af6eb06fcf961db804a00ccd380fe8447947
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search results or distribute malicious content. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic.

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=allah+allah+gojol+video
    • http://files.heavenbphotos.com/uploads/1/3/2/6/132681880/sanumobax.pdf
    • http://waforerep.nurrd.com/uploads/1/3/0/7/130775883/3772014.pdf
    • http://files.road2gold.net/uploads/1/3/2/6/132695321/xalewafov_meladur_lirobazefus.pdf
    • http://files.5elements.ch/uploads/1/3/0/7/130776542/wuvasoluwo.pdf
    • http://kejezizus.michaelfarisart.com/uploads/1/3/1/4/131407469/9040300.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6581/7753/files/lodawudogoron.pdf
    • https://cdn.shopify.com/s/files/1/0443/3369/5132/files/add_watermark_to_foxit_reader.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/44950180618.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/araby_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/87596491564.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/58678483183.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/gamifajoxoboruvelemipaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/math_2_digit_addition_worksheets_without_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5925/files/46466299173.pdf
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/free_autumn_word_search.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e0f.bin
51bbf40f9306e98f4b81d63cd5b63dfe384930d2dd52c54712f15eeaf071ce5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0F 4936 bytes
font_01_sfnt_off00005ee0.bin
951224f55aa2604eaa25cda5f52975721f5bf623779c98cd74a75470a8f15de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE0 7708 bytes
font_02_sfnt_off000077c5.bin
b6d39b5329a8c113f7c73484def3be847a9e62a371e7544d7d27f5db9bbadcfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C5 13480 bytes

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