Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fe91326d7b739d…

MALICIOUS

PDF

55.5 KB Created: 2020-08-30 03:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe84fad282724c022964d1f215bd913 SHA-1: 22505daa49b762724b63af64b62c2b41a451d8a6 SHA-256: 20fe91326d7b739daa737b9c7777e007a14a228394844c07012ebb55a97a2ee4
152 Risk Score

Malware Insights

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

The PDF file contains a link farm with 30 external links, many of which are hosted on Shopify and appear to be SEO-optimized. One critical heuristic identified a link to a known malicious redirector (ttraff.cc) which is used to deliver the final payload. The document body text, though heavily obfuscated, contains the string 'Beats driver for android' and a URL that appears to be the same as the malicious redirector. This suggests a social engineering lure to trick users into downloading potentially malicious software.

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.cc/wix?keyword=beats+driver+for+android
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/microsoft_office_access_free_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0451/6803/3946/files/laporan_bblsr.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6503/files/chemistry_1_worksheet_atomic_structure_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/mapejalusedasuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/abbreviated_mental_test_score_amts.pdf
    • https://static.usrfiles.com/ugd/b8c837_652ec82e4edf4d4abc86e2035eafe8e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d0db37e54a4621abbaad0e5e4afaaa.pdf
    • https://static.usrfiles.com/ugd/3e9e83_10376f8e479e452f8fdd9c381d6848b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc2df725d53a4123ae0e48095199d0fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6467e6c5d4c4f59811ea76a7f7d1008.pdf
    • https://static.usrfiles.com/ugd/d99ef3_64e79e9594fa4e4c823c8ba788757a2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbde0697eade453e89748eba8e4cc329.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb5652d359d247b2b909d39f0d8b242e.pdf
    • https://static.usrfiles.com/ugd/a44510_cd5cae53f4f2425fb027a8be4558a395.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_aeca7ff3352340769a71340b8595be72.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b0b0bfba6b743bebedf975decc995d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc64a79bd1e343d5a31e14258736a2f3.pdf
    • https://static.usrfiles.com/ugd/ea2f88_fa667125e2e44c9bb29062ea9575636a.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_off00009b69.bin
df4077d80ee501baa275581aa94122bf9c92a360efb38f6eef9d9bc22f4874e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B69 4980 bytes
font_01_sfnt_off0000ac67.bin
e1cd922dc1d86a6787103edc60228b563ba78a1751781da1b9332f430d5d8f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC67 10600 bytes

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