Malicious PDF — malware analysis report

Static analysis result for SHA-256 15464c43e4b011c6…

MALICIOUS

PDF

52.6 KB Created: 2020-08-21 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9754492e43f8a223335d543ee8205e54 SHA-1: 206144d64e8c7e5028cb080e4b845bf9902e75f3 SHA-256: 15464c43e4b011c6a77978262170697249bbccfa34686857346ac73352efce62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for further exploitation or phishing. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO manipulation or distributing malicious content.

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=happy+birthday+brother+song++in+tamil
    • http://begidix.sachemeastlacrosse.com/uploads/1/3/0/7/130739090/5944000.pdf
    • http://files.wardswaterpumps.ca/uploads/1/3/2/7/132740204/ligexupowenik-rofibinu-tadixodetugujej.pdf
    • http://files.workrescuegear.com/uploads/1/3/1/6/131606035/zukegipufefuzedixusi.pdf
    • http://files.accentsfromheadtotoe.com/uploads/1/3/1/4/131453817/1164200.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/46276761833.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/bakawiduwaforukoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/fundamentals_of_multinational_finance.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/teri_aankhen_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/3939/9842/files/tozizaxatalikofuvofekafid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/27553047990.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/jogavuxugifovizor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/91060486365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0431/5044/2660/files/barashada_salaada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000872e.bin
d342c18ab4a3ef30618adea8dbf237aab7c0eaa05160cb298f98d8305d3c0d3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x872E 5576 bytes
font_01_sfnt_off000099e8.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E8 1800 bytes
font_02_sfnt_off0000a276.bin
9ee8861162e3237d87b07d270f492e47ace17fc14a3154171c08478c73d7982e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA276 10044 bytes

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