Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6e6e539396661e…

MALICIOUS

PDF

69.5 KB Created: 2020-08-03 08:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4968f2171e609d6766297c0b37c423d SHA-1: 08a56327396e7ce6ce9e0b119ee53ef0be5f1def SHA-256: ef6e6e539396661ee2ace38de1e67caa028ea1b61236616ea5e885adc051aae0
152 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.cc/pify?keyword=440+287+5529'. 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 redirector URL, reinforcing its 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.cc/pify?keyword=440+287+5529
    • http://files.danhusebyphotography.com/uploads/1/3/1/4/131453984/3847985.pdf
    • http://files.rumonek.com/uploads/1/3/0/7/130776304/4410574.pdf
    • http://files.montaukbeachbungalow.com/uploads/1/3/0/7/130776069/10e9fe1918ba6.pdf
    • http://files.burgeshsband.com/uploads/1/3/2/6/132683088/faduxi_gujez_rudofixipis_lowalewesijujil.pdf
    • http://files.xuluprophet.com/uploads/1/3/1/4/131437307/362989.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/kedipifigol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/22539445041.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/49334900801.pdf
    • https://cdn.shopify.com/s/files/1/0433/5661/8917/files/85347239849.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/pevareruwususatulexowir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2855/files/bungie_code_redemption.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/twitter_remove_followers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/29576340825.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/62597517939.pdf
    • https://cdn.shopify.com/s/files/1/0432/2610/3971/files/22217808695.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/50160818804.pdf
    • https://cdn.shopify.com/s/files/1/0431/5371/9452/files/detiwugave.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/us_city_populations.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/kapugaliluwuret.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_off0000d4ce.bin
0999115c15c88623119345016d5c02079e58d9a67f64b5725000e61c76442080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 4984 bytes
font_01_sfnt_off0000e5f1.bin
400a7ac187c437a45c145d0cd3f5c51a09d7fd1c4c4424db07441b984f9b7136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 10224 bytes

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