Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6890a59b838182e…

MALICIOUS

PDF

40.8 KB Created: 2020-08-31 06:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c595af9f2343eaf78e83c01ae0d2161f SHA-1: b471e7d15e9bada9f2980497547a4a79a6898cc8 SHA-256: b6890a59b838182e32775af80ad9bba01e6a96fb1cf01b8cca376f0a4f8ba4ef
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking URL, likely intended to lure the user into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=limiting+adjectives+worksheets+for+g
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/liduwudo.pdf
    • https://cdn.shopify.com/s/files/1/0462/7287/2610/files/86288615078.pdf
    • https://cdn.shopify.com/s/files/1/0450/1933/2766/files/appium_tutorial_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/27503251232.pdf
    • https://cdn.shopify.com/s/files/1/0434/5017/1554/files/6th_grade_science_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/8308945451.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3282/files/carranza_s_clinical_periodontology_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/sukubof.pdf
    • https://static.usrfiles.com/ugd/6260fe_14b3e4d8811e45a0968764cec0ec3587.pdf
    • https://static.usrfiles.com/ugd/b8c837_d31096489efc48f1ae5892255feb8075.pdf
    • https://static.usrfiles.com/ugd/451461_c59263a35c574af1bade15920bf6b9ae.pdf
    • https://static.usrfiles.com/ugd/7dd30d_7c0670822d85491e90440ffcfc00312f.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/93179734805.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6205/files/bridgett_devoue_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4979/files/6362518280.pdf
    • https://cdn.shopify.com/s/files/1/0430/0455/9519/files/flight_simulator_x_for_windows_10.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_off000050f3.bin
cd453b80f1136933db0adb5662252e33a75c399495a86a9049720d2f40e97d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F3 4156 bytes
font_01_sfnt_off00005fcc.bin
ba7a6c01a0bf7b93e8bb181de6a49ea8705f4ba173c4fe15b7ee61bb60698b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 5636 bytes
font_02_sfnt_off000072e0.bin
7a57b65c1e5ad5115f656f1d34015caedb6c533595eb6fe1c43c3bf4d508fe92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 10172 bytes

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