Malicious PDF — malware analysis report

Static analysis result for SHA-256 5262a6b42d0def4c…

MALICIOUS

PDF

55.8 KB Created: 2020-09-01 10:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d9a041a0d85466ba59d66d0daac62e SHA-1: 7598c59bc282ebd09bf3c79f4b4dee4a7211475b SHA-256: 5262a6b42d0def4c8b978d75fb090882eb74a2382d1df2f771444bf453e29075
92 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for free antivirus software, directing the user to the malicious URL. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 3

  • 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.
  • 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/wix?keyword=antivirus+para+android+2019+gratis
    • https://static.usrfiles.com/ugd/b52961_b19a7f9c80d5470faea149caf3886884.pdf
    • https://static.usrfiles.com/ugd/585b1d_672c5089ef70460e9fbc862e15fe3429.pdf
    • https://static.usrfiles.com/ugd/a48928_b4004372462f41a5b8c0441c92aab11e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad69ca6c5edb4a7694b201c92672dd7f.pdf
    • https://cdn.shopify.com/s/files/1/0432/4471/6199/files/tesadupewujebalo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0301/files/wave_hand_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/10630407878.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/rudujunujuwaduduzem.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7710/files/apache_commons_io_2._5_api.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708e.bin
c013c4037159025239e7bcc7fa4bb7892805f8274ca5cecd48b62de43d0bd903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 6904 bytes
font_01_sfnt_off00008226.bin
01c7e33db16d1182dc69954bb865cdb398511050e4715b69fbdbdc94e91af74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8226 5388 bytes
font_02_sfnt_off00009478.bin
c7f59856b76cfb2649f15f96a8a217801da939b9a0b8878a6e6432773021e2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9478 2400 bytes
font_03_sfnt_off00009f2e.bin
212a7154af9520172b435a21c8eaa19b9d5156201f33693fd53dba46f2bf608a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F2E 10516 bytes
font_04_sfnt_off0000c31d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 4324 bytes

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