Malicious PDF — malware analysis report

Static analysis result for SHA-256 829e11fdd2b881b6…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 21:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9fef79478b439559dbb67274aec3b71 SHA-1: 22eed8a9f898f1f9f40863564432b9e7d214ae3f SHA-256: 829e11fdd2b881b69ae6bc2d5818da836df0cc592dd337d9f70017c1c1434111
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to a redirector infrastructure known for malicious activity. The document body text and embedded URLs suggest a lure related to a 'barcode scanner app', likely intended to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=barcode+scanner+app+android+free
    • http://files.micasitarentals.com/uploads/1/3/1/4/131406744/tibitu.pdf
    • http://tugul.rudkin-genes.com/uploads/1/3/0/7/130740480/5577912.pdf
    • http://files.tabdoughertyart.com/uploads/1/3/1/4/131455141/5852835.pdf
    • http://fobapetov.louthanlab.com/uploads/1/3/2/7/132740748/fasimofi-pafodov-furozitez-gotakurinosef.pdf
    • https://androidappsforme.com/wp-content/upl
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/nevudujowedapuxemuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0434/2664/4125/files/adjective_clause_lesson.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/jopazuvowumap.pdf
    • https://cdn.shopify.com/s/files/1/0428/6054/4156/files/8916675742.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4208/files/nudavokewodekotubewora.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5271/files/45574157044.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/nuligowetogatobufu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0822/files/1202668913.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/nakefufekobavupina.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/16481752231.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/singular_and_plural_nouns_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/86007061910.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/cardioversion_farmacologica_y_electrica.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dc6.bin
c6b0eea517e4dc2ef0ce0e482d5f19f652de1710dccd5d7ad68ff658002f9e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC6 5164 bytes
font_01_sfnt_off00007f5e.bin
059e5a6686ffcbe40b0097bca84726e1d1d2f32cb4fa6d06316ac502445ea447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5E 10000 bytes

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