Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ec8639fdc16d65…

MALICIOUS

PDF

52.4 KB Created: 2020-08-31 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1630e3342f83c77cc8aebf572b9f7a6a SHA-1: b09539b5dc1068ba63e2285338d7f2a8f0b2865c SHA-256: b5ec8639fdc16d6569b0943527c2a69606785974f10313c165e70823ffd993c4
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.ru/wix?keyword=corrig%25C3%25A9+crpe+2016, points to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, with many links pointing to static.usrfiles.com, suggesting a potential SEO spam or redirection campaign.

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/wix?keyword=corrig%25C3%25A9+crpe+2016
    • https://static.usrfiles.com/ugd/50de67_356645414dc8438b95593848f7b0a5dd.pdf
    • https://static.usrfiles.com/ugd/fbccce_d44e5d3c25e24ba289d74f3ce801d244.pdf
    • https://static.usrfiles.com/ugd/edb4a7_b870591d31af46b8b328fc5d70c5a744.pdf
    • https://static.usrfiles.com/ugd/b8c837_b72dee6326534a7fa73e2601425d7c25.pdf
    • https://static.usrfiles.com/ugd/b65acf_24ac7c1259514ba2bf1e805a2fd9cad0.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_7527b00550574317935728c52d2d9382.pdf
    • https://static.usrfiles.com/ugd/79cb75_420512380dd343a6aed0230421055972.pdf
    • https://static.usrfiles.com/ugd/917232_e92c7affef454430a3a2255d7ccba7aa.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_bab06b0027124b478327260f38f60618.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/bully_english_1-_5_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/morse_falls_risk_assessment_tool.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/siwexezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/black_circle_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/bubafog.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/gezawepowinu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/calendar_june_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/tajebawejujozuzalaxuje.pdf
    • https://cdn.shopify.com/s/files/1/0462/6985/7941/files/erno_laszlo_white_marble_sheet_mask_review.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_off00008842.bin
1a0dbf89e6dcaf6f073c950fab6f56ed51b475fa9eb5e930f30694e73d1a11ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8842 5208 bytes
font_01_sfnt_off000099da.bin
aef2747597aa66e3386b0d3fb070bc28cce493eff093a0cda0fcfa267743e3b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DA 13740 bytes

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