Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b08f4f04eccc135…

MALICIOUS

PDF

51.0 KB Created: 2020-08-14 04:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f7989727dd3ec7158c514a2b0e32937 SHA-1: b9f21673bf8c8fe7b18ea6067e3274a3bd7a9f3f SHA-256: 7b08f4f04eccc13549bb6df048217c156a0def73e8f3fa3385f3598343d1f611
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the text 'What is facebook status report' and the malicious URL, suggesting a lure. The PDF also exhibits a link farm behavior, with numerous external links, many hosted on Shopify. The ML classifier 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=what+is+facebook+status+report
    • http://files.thefeltfactory.co.nz/uploads/1/3/0/7/130776841/xizixexa-dajawotubep-fekifomidele.pdf
    • http://files.videopeople360.com/uploads/1/3/0/7/130739415/d142b6.pdf
    • http://files.pjcarradori.com/uploads/1/3/0/9/130969211/641889.pdf
    • http://files.dorothykellyacademyofreflexology.com/uploads/1/3/0/9/130969709/kitakiwus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8932/9312/files/ludun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/60544896249.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/sukisalupofolojekuxive.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/loletexakelujekadosowuko.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2675/files/66706526537.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4556/files/pinivelibodu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/27440259304.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/twinkle_twinkle_little_star_poem_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9592/5671/files/jugazawaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/vibajugexewas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/dictionary_of_synonyms_and_antonyms_in_english.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/
    • https://cdn.shopify.com/s/f

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b75.bin
5d3cf55f410df20cc02ad6a30ccd979812bd257b03fe930b6729888f29cab952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B75 5064 bytes
font_01_sfnt_off00008cc1.bin
353427c71b2e815efae828b95a7f291b381b3f28010c992c79cf09dd6dce0ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC1 10468 bytes
font_02_sfnt_off0000b07b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 4324 bytes

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