Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb291a425ddf5b2…

MALICIOUS

PDF

50.3 KB Created: 2020-08-19 08:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: effb8788a42702649059ad8ab8f42cfe SHA-1: b67efc0bb1003d0e6e76188f8f4c850a71f7776d SHA-256: 8fb291a425ddf5b2d7be8418d8dbe7f7813cfbfbb10fe31f43b6e65bec67a953
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body also contains this URL, along with a list of other URLs hosted on Shopify, suggesting a link farm or content distribution network used to host various documents. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to a malicious site via a deceptive link.

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=media+player+k+lite+codec+free
    • http://files.anneyleather.com/uploads/1/3/0/7/130739128/tujipujibizirazog.pdf
    • http://kotovibi.kazmetixartistry.com/uploads/1/3/1/4/131453723/kofoketapim-gilim-fifurebekejewa.pdf
    • http://files.angellight.lt/uploads/1/3/1/4/131437037/6925286.pdf
    • http://files.mt-akademie.com/uploads/1/3/1/8/131856698/tasijoxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/guitar_barre_chords_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/netonozorokemerexuri.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/across_five_aprils_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/funny_tts_lines.pdf
    • https://cdn.shopify.com/s/files/1/0438/2641/3725/files/yamaha_rx-_v371_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/firimulevuwaforexix.pdf
    • https://cdn.shopify.com/s/files/1/0437/8614/1847/files/corporate_brochure_design.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/wufumituvolupaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/minecraft_crafting_dead_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/fundamentals_of_general_organic_and_biological_chemistry_8th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007699.bin
014d4c978579ff73e2e5d95bdadc7579ee2d953259b41edfc8ff642253ac036e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7699 4824 bytes
font_01_sfnt_off0000871b.bin
0a1c53dcee49630d5507eef9ae5940f4e82aea650154db5d3a90c4acd9293d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871B 11728 bytes
font_02_sfnt_off0000adc8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC8 4324 bytes

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