Malicious PDF — malware analysis report

Static analysis result for SHA-256 d838db5ee24ccf47…

MALICIOUS

PDF

96.0 KB Created: 2020-09-01 06:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b1e8e3661f15a4341eb96ed97c20a7 SHA-1: 0fb6a4760c9b2190a982c16ab97ad0d2abf06253 SHA-256: d838db5ee24ccf4732f750c676247e89a7dd27c362a561d45be84615d55bf461
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a movie title and the malicious URL, suggesting a lure for users to click the link. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=mayabazar+1957+tamil+full+movie+free
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/botezosural.pdf
    • https://cdn.shopify.com/s/files/1/0447/9208/6685/files/first_cambridge_exam_practice.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/69774731022.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/batuworaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/92858683374.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/52661288203.pdf
    • https://static.usrfiles.com/ugd/6d59ab_7e696018d3234adda0a93ec1b2e4c07c.pdf
    • https://static.usrfiles.com/ugd/2e16aa_fc7a37abaea14d16bbd37afa36a60499.pdf
    • https://static.usrfiles.com/ugd/bf0735_5c1e70ea580f4643980d7fc78b7d7c6c.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_e479103f143740d6864f48d40a749bc3.pdf
    • https://static.usrfiles.com/ugd/cafc24_a49d338f3f3b488aa93a9ebbff935ad5.pdf
    • https://static.usrfiles.com/ugd/80c1db_e31200b5eb7b4d42ab1b79da2464bf02.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_off0000ddb2.bin
5981b0cafd4e8cc3785a4be635b178f7e83ca3de13fac0eecca5dbc3cf8818ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 5504 bytes
font_01_sfnt_off0000f087.bin
55ee86f7b8ee5e66d3c7413c1d3ec1077f627bc12cd99368121a0248be02750a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 7752 bytes
font_02_sfnt_off000106f1.bin
c69bebb772c11f2bbf22f07e12b8c6dd7ec96841c5f91867821951b51f53fea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F1 20968 bytes
font_03_sfnt_off000137f8.bin
650b34a2a05f4d89e81215b669af7eaf8ccec8f2b283983f562b0394c44aef0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F8 10636 bytes
font_04_sfnt_off00015c8c.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8C 16164 bytes

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