Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacb66007d901fd0…

MALICIOUS

PDF

75.8 KB Created: 2020-09-01 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ca1016c3f96bcf1072c00b42fb58cf SHA-1: eb387e25750b941a75cab4d9b7cfca4b6b4c5ac9 SHA-256: eacb66007d901fd0e2ccc2f431746eb78c6458abc4357d652fc57ea26d3dd9bc
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a large link farm. The embedded URL `https://ttraff.ru/wix?keyword=ancient+greek+city+states+pdf` is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links, suggesting a delivery mechanism for further malicious content. No scripts were extracted, but the sheer volume of links points to a content-driven attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=ancient+greek+city+states+pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/dexomume.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/aafp_hyponatremia.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/70554996192.pdf
    • https://static.usrfiles.com/ugd/0cd019_16008a6d96334ebab64206800372c045.pdf
    • https://static.usrfiles.com/ugd/d5415a_fab9b31b202e42ba8e6e2b5242523e57.pdf
    • https://static.usrfiles.com/ugd/3794ad_2ec7e32f001a42c293efa96685965073.pdf
    • https://static.usrfiles.com/ugd/353d00_eaa4fa9e222e4270b0223c202d211a10.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6099/files/magnetic_effect_of_electric_current_class_10_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/garmin_basecamp_linux.pdf
    • https://static.usrfiles.com/ugd/10e3af_f38e554ea38e4faeba5e6df39a45bcb5.pdf
    • https://static.usrfiles.com/ugd/3ce946_8e95b14af8ee4af0b1bc0ec7acfc9a3b.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
stream_005_off0000e786.bin
d4f9bf89d68cda943fb7223d3c818d0de6dd679198c7863fea6288916c43b0ae		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE786 18120 bytes
font_00_sfnt_off00009edb.bin
28217d415efffc323c4218c303a646dca28bb212835b62a1dbe25409358ab032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDB 5124 bytes
font_01_sfnt_off0000b05d.bin
8ed73a312d8c75627ac10de645e4692c8795495becaaa5b6e91493fa20c4abac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 19640 bytes
font_03_sfnt_off000103b2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 4324 bytes
font_04_sfnt_off00011173.bin
d0d1024852678735413db88605ce99e748e619a2e540c3a6dd06c3e311481a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 6300 bytes

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