Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21b5ef18549a060…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2c77d68d4a32f7de2e172164e1985b SHA-1: 12fd9f634b316c0b7da866fcc0f653793e64f621 SHA-256: f21b5ef18549a0602c41e9d386da6d0794fa32bd3723946e690dcfbcc70c2ed0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=apsara+aali+marathi+song++pagalworld'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, also contains the primary malicious URL, suggesting a lure to external 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=apsara+aali+marathi+song++pagalworld
    • http://files.vicenzas-crostoli.com/uploads/1/3/1/4/131483253/9062675.pdf
    • http://files.lifewithtoribrand.com/uploads/1/3/2/7/132712315/dodurejili.pdf
    • http://molexuva.warleymc.com/uploads/1/3/0/7/130738970/xebimesed_kenarugefeta_marivovuwo_boretitikuf.pdf
    • http://vimami.brilliantdesignmontessori.com/uploads/1/3/0/7/130775413/3602660.pdf
    • http://takumupon.zenjitsudojo.org/uploads/1/3/0/8/130813780/kamoritarolus.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/44641475250.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/4944395751.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/kotirobexawewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/xazosepuvoni.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/tazada.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/k-_lite_codec.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/28755194868.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/35061318781.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051e0.bin
92598758980376bea1b59936f1712837ffd5862bbe28c7096c1e282108e9cc51
pdf-font-stream PDF embedded font (sfnt) at offset 0x51E0 5456 bytes
font_01_sfnt_off0000644f.bin
e9fc57cc9bc870b66d0818185c6e397638a6d651600b1d8f2eb54a33658de7ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x644F 14296 bytes
font_02_sfnt_off000091a1.bin
c2db7c2181970c3e57c191ccf80c206bf114659cdb49212919bb816e6aaa79c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x91A1 3328 bytes