Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b493039050d9c2e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-14 05:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec6e52e819e70868eb493ffb98d6a1d SHA-1: 06986d4d39c7c8e3bee1ed9db79f5d3c6de523d6 SHA-256: 1b493039050d9c2ea2b5314935ca10b58b68232884cbefbb49c58e5ecb03158a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), while another detected a large PDF link farm hosted on cdn.shopify.com. The document body contains obfuscated text and a URL that appears to be part of a SEO manipulation scheme. No scripts were extracted from this sample.

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=singapore+math+fractions+word+problems+worksheets
    • http://files.joyfullifehealing.com/uploads/1/3/0/9/130969917/2282238.pdf
    • http://files.goataddictionfarms.com/uploads/1/3/1/8/131858661/7e75278b6f23.pdf
    • http://files.phsboosters.org/uploads/1/3/0/8/130813696/takorisobemanipeje.pdf
    • http://files.acrosstheinfinitevoid.com/uploads/1/3/1/6/131637016/falezazepiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/energy_converters_mod.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/engineering_graphics_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7537/0136/files/30893379265.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/jovutonazajasegagizid.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/83655122928.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/histology_guide_pituitary_gland.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/nanos.pdf
    • https://cdn.shopify.com/s/files/1/0438/3100/1250/files/katyusha_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/apc_smart_ups_750va_lcd_230v_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/kalivivosunevumufajutizov.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/how_to_paste_in_vim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/alfie_kohn_theory.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b3.bin
7266e2df449daf6edc05ec5b2310eefa1f03b4aff69955b09867b059aa869915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 5756 bytes
font_01_sfnt_off00007c18.bin
84c8352c0930a3315ea3b32863c688438058da5a326d05a98367af41c85e5b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C18 10384 bytes
font_02_sfnt_off00009fd1.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD1 16204 bytes
font_03_sfnt_off0000b501.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB501 4324 bytes

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