Malicious PDF — malware analysis report

Static analysis result for SHA-256 29141856c506f2b0…

MALICIOUS

PDF

43.8 KB Created: 2020-08-13 11:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3e1b705d422c08e98c352fda86652d1 SHA-1: a40fd630966cd5096c337c0a0ee4970b456dd60f SHA-256: 29141856c506f2b0916b8ba0ccfb7ec6639175a7cc4ed7e6dc5b1161dbac83a2
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm. One of the embedded URLs, https://ttraff.ru/wb?keyword=weissenhof%20mies%20van%20der%20rohe%20pdf, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, further supporting the malicious intent.

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/wb?keyword=weissenhof%20mies%20van%20der%20rohe%20pdf
    • http://files.familyloilty.com/uploads/1/3/0/7/130776130/dowasigunafet.pdf
    • http://files.mehlmansmunchkins.com/uploads/1/3/0/8/130874090/9301479.pdf
    • http://files.tsgsalesspot.com/uploads/1/3/0/7/130775607/xegalisiforix_nuluxinabokezas.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/21590708949.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/begowazexegupesizu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/xirojupusudir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6916/9045/files/the_scarlet_ibis_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/salasoxakoxeledixogamoze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9418/7933/files/kikamimavuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/jemuduru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/cambridge_checkpoint_science_workbook_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/4016/1435/files/pejutipulolutufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/calisthenics_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1075/files/candidiasis_bucal_nios.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/gojuku.pdf
    • https://cdn.shopify.com/s/files/1/0431/1370/9730/files/93425966001.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006873.bin
66351f32ab926504c6de9c5ba31e69cdf3a63b6e54861009614b38d4044a9219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6873 5320 bytes
font_01_sfnt_off00007a6f.bin
c82240c60258717da8ed8a890baad9bd3279f7da57bc9444c497ccbbb5eeea1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 11580 bytes

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