Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f913911e65481eb…

MALICIOUS

PDF

34.9 KB Created: 2020-08-26 16:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d02854a0f5740b99d03276c28a5a5f SHA-1: 255fcf7aa52d5137edecc3edb07b1bfbecfdfd9e SHA-256: 1f913911e65481eb4b00b3ae3a7ff46d3785848a31f813f60c47089a185a82a8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=libro+de+formacion+civica+y+etica+3+de+secundaria+contestado+2019'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to other PDFs hosted on domains like cdn.shopify.com and various other subdomains. The document body, though partially corrupted, contains text suggesting it is a book, likely a lure to disguise the malicious intent. The ML classifier also 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=libro+de+formacion+civica+y+etica+3+de+secundaria+contestado+2019
    • http://files.nicksallens.com/uploads/1/3/1/3/131384589/mezexelijixuxewez.pdf
    • http://sudawuse.kathleenajackson.com/uploads/1/3/2/6/132681352/feberudo-gadojim.pdf
    • http://files.mytownmarketer.com/uploads/1/3/0/9/130969791/5434301.pdf
    • http://fovirilab.alextoenniges.com/uploads/1/3/2/6/132681504/nekijizim-xabixirapas-pusosiraz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/cervical_spine_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/don_t_look_back_in_anger_piano_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/0547/4978/files/ditunekagun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/warframe_interception_missions.pdf
    • https://cdn.shopify.com/s/files/1/0450/2428/0726/files/bristol_stool_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/1801/9235/files/schindler_s_list_violin_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/85612262580.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/batata_doce_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/geometry_construction_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bizem.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/66881704210.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_off00004870.bin
25b71d419860c00d71df652960f78788e47e46dfa5a0592a36904d3a64ead8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4870 6024 bytes
font_01_sfnt_off00005ce1.bin
6e770e980b2906edfa7ff699b354cdbc1c75cd3b930d307eb7cf64a9c36f9e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE1 9732 bytes

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