Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bdc49c3d96c546…

MALICIOUS

PDF

119.7 KB Created: 2020-08-07 23:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c01907ced31b0828944b7e42e83baa7 SHA-1: 4f9c27ddf23533662ea60df74fc0b32e3e3d1188 SHA-256: 08bdc49c3d96c5466bc3fbe17a4443ff99657f7afe6c38501cd48f0bcc7adeaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious content. One prominent URL, https://ttraff.ru/pify?keyword=ap+module+grade+8+teacher+s+guide+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a deliberate attempt to disguise the true nature of the links.

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=ap+module+grade+8+teacher+s+guide+pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://files.akpsipsu.co/uploads/1/3/2/6/132695707/limuxotozosutija.pdf
    • http://files.coolgeekzatl.com/uploads/1/3/2/6/132695492/dubavaka.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/94765937169.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/80446185639.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/79471676512.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/xelebet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5919/1712/files/98441845837.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/kitajem.pdf
    • https://cdn.shopify.com/s/files/1/0433/1431/5422/files/fidatarukiwejop.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/kwikset_913_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/xezegunukuxoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/41863287849.pdf
    • https://cdn.shopify.com/s/files/1/0437/9528/4130/files/78072419605.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/tratamiento_del_absceso_hepatico.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001835b.bin
6c2ba40c2d39a2076ac057e2d4d444dae3df21dee8cc8a90a7ef97019a760282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1835B 2256 bytes
font_01_sfnt_off00018d74.bin
fb0e66af0d00b1b1e0ca92b0c55a479eae4fb5e075f294451e2b54d227c42d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D74 5752 bytes
font_02_sfnt_off0001a0d9.bin
fe3202f157313e3e1264149afdc52d1d0fd9000c1e7ef803318f6b67cf9d539d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D9 15768 bytes

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