Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac8b60d219a291f…

MALICIOUS

PDF

60.8 KB Created: 2020-08-09 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25814c85bfbce84e580350a884a4969b SHA-1: 2014b00fdddea2ea3bdbfe39f98cb043c99b30c0 SHA-256: 3ac8b60d219a291fdd9eee11df9c3e6bfcc5deea27ef01479467875fa2da64ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of a phishing or malware delivery attempt.

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=2020+kannada+calendar+pdf+free+download
    • http://files.dropertytax.com/uploads/1/3/2/7/132740541/lovuwinozuxexajapare.pdf
    • http://girupovid.anybodycanbeaketobody.com/uploads/1/3/1/8/131856772/jimafawunuxewawimu.pdf
    • http://files.senseabouthomeopathy.com/uploads/1/3/1/4/131406982/bidatofiligos-totavumoduvibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8964/1116/files/15002290189.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4387/files/62483222248.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/sulelesaguvefivujomoguji.pdf
    • https://cdn.shopify.com/s/files/1/0433/9826/7029/files/linux_zip_folder.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/24052355066.pdf
    • https://cdn.shopify.com/s/files/1/0452/1210/6912/files/mvs_assembler_language.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/88217860314.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/the_core_peter_v_brett.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/momifopibezepumezofu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/8809950904.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/kujedipekozotu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9726/files/96818132292.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
stream_004_off00008256.bin
2379fb6991a996bb7dda53613639d086d65214988ceec8a67af27d62870a431f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8256 19332 bytes
font_00_sfnt_off00007021.bin
4b70ec041676ee56270ab69c18107a4ebce3cc4c022f3524a5ca8742c41d0f40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 5308 bytes
font_02_sfnt_off0000ad4a.bin
5acbe6840ece60ada518a1596a0c12718b479804d7f8f94b8d7779f8c48a0815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4A 10112 bytes
font_03_sfnt_off0000d027.bin
4aab65b3bf882586ccedf56cf0eccd202107bedfa6f25e2adc4bec8a3fe197c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD027 16256 bytes

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