Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb507bebecc79d0…

MALICIOUS

PDF

46.0 KB Created: 2020-08-09 20:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc5e4a90705a7b421dfe271c4f5eff6 SHA-1: d3ca0156b7689aa27ce66f90f13bb346faa0fd6a SHA-256: dbb507bebecc79d0f8fa2ed52575dd19a4b2760f001c099544e916eaed2c1bb0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'benefits of extensive reading pdf' and includes the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=benefits+of+extensive+reading+pdf
    • http://files.detroitcomposersproject.com/uploads/1/3/0/7/130739693/valaw.pdf
    • http://files.smokepitfairytales.com/uploads/1/3/2/6/132695397/bc7047cce9ec.pdf
    • http://vivafav.zebradental.co.uk/uploads/1/3/1/4/131437604/jilivuramir-mevupuvaselow.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/pozotozunanalun.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/safurisureb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0836/8545/files/conair_hair_trimmer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/gixagivojodoseboruduf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/jatikigu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6315/5615/files/verbal_reasoning_aptitude_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/cadena_trofica_acuatica.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/bank_exam_preparation_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/caldera_rip_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/89410600779.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/love_hurts_lyrics_incubus.pdf
    • https://cdn.shopify.com/s/files/1/0432/0742/6216/files/19943023705.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7047/files/data_structure_and_algorithm_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000760d.bin
689417370d26e1343e466554fa9afb22ba5d51d4c0424a5e83542bf8fea2c682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760D 5352 bytes
font_01_sfnt_off00008867.bin
19df3f32b26d73f04ad94639e2455c80e00dfbdcf72a9b74830efb35d3c90304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8867 10116 bytes

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