Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9df7ad6226b9d7a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-19 22:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fda0ac848ea702507b7f9fc5c4c45820 SHA-1: ad18e1f90190f914a03db3fcab1dd0abac51e47c SHA-256: b9df7ad6226b9d7a8d0bd5a3f3c4a53cbb0d8164e159597d6cbda091d24fc5b1
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm and another identifying a redirector to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.cc/pify?keyword=aircraft+maintenance+manual+vs+component+maintenance+manual, which appears to be a redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on cdn.shopify.com and various other domains, suggesting a coordinated effort to distribute malicious 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.cc/pify?keyword=aircraft+maintenance+manual+vs+component+maintenance+manual
    • http://files.glandwrmill.co.uk/uploads/1/3/2/7/132740485/gadinozuruni.pdf
    • http://files.danlazarusart.com/uploads/1/3/2/7/132710779/sexekotuweta.pdf
    • http://files.vancouverspeedskating.com/uploads/1/3/0/7/130775978/4131864.pdf
    • http://files.christinecarr.com/uploads/1/3/1/4/131407227/2349125.pdf
    • http://files.keirhardiesociety.org/uploads/1/3/0/9/130969089/5801654.pdf
    • https://cdn.shopify.com/s/files/1/0435/0840/0280/files/fargo_season_1_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3439/files/93396934111.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/filexixu.pdf
    • https://cdn.shopify.com/s/files/1/0449/3040/0411/files/avast_turn_off_popups.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/fundamentals_of_computer_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0234/files/29665072810.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/95790696455.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/english_to_urdu_vocabulary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/membrane_potential_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/homemade_manual_log_splitter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a3.bin
f80b308c7753d97763e79d0a4f28ac7ed65205708f03367b930a7e86c08c65bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5092 bytes
font_01_sfnt_off000071d8.bin
cba68f2fc5429bccce354c7988cb039a18a47daac04c4be4ccb00f4193cf808a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D8 10080 bytes
font_02_sfnt_off00009458.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9458 4324 bytes

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