Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfc4c0d4dab5e4f…

MALICIOUS

PDF

49.6 KB Created: 2020-09-01 12:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d07534a54974850d1ae709dcbe795db2 SHA-1: 4ca2bdd072015fcfcee68eeede3cfa09fde6abae SHA-256: 1dfc4c0d4dab5e4ff78a6d554a2f7b1be732001f57fb1a5020c9afa97ed37b8e
152 Risk Score

Malware Insights

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

The PDF document was identified as malicious due to a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it contains a large farm of external PDF links, many hosted on Shopify, suggesting a link-farming or redirection tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded malicious URL is the primary indicator of compromise.

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.com/pify?keyword=callback+android+fragment
    • https://cdn.shopify.com/s/files/1/0430/3382/1347/files/73878499388.pdf
    • https://cdn.shopify.com/s/files/1/0440/0345/9230/files/55090455605.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/vi_commands_in_unix.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6207/files/ayushman_yojana_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/39339557823.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9996442cf4f24886946e74f2cdc9d.pdf
    • https://static.usrfiles.com/ugd/11f207_eb940b246dab40869d1f672783c46dcb.pdf
    • https://static.usrfiles.com/ugd/9e41f0_9379c5d5ea354fe6af5c509691fb98a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_03e43f3c253b4dedb96b00dbd9981e3e.pdf
    • https://static.usrfiles.com/ugd/6da380_89bb01d87a7f437f92d80ff87e5fef13.pdf
    • https://static.usrfiles.com/ugd/3be3a7_2c8c4ea4326b453ea5dfbe017974a089.pdf
    • https://static.usrfiles.com/ugd/a4e402_93c90f04584f445bb5611f33fd4a80f8.pdf
    • https://static.usrfiles.com/ugd/9f6a24_6503d87cb06740ae8ce20ab357512c6c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006136.bin
de06c16d52118d680968e65a5143bcd169dabc8bb39af53fd39724c823dec09e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 5272 bytes
font_01_sfnt_off00007308.bin
3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7308 2140 bytes
font_02_sfnt_off00007ce2.bin
76e6c673df927ee418b9f77565cdfd93b5f79dd9bd828756ef42f6c254a35c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE2 10564 bytes
font_03_sfnt_off0000a11f.bin
bf192b1231e9900984b7ead4524f82f7d6fd5788873c200c445560301f5d5eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA11F 16664 bytes

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