Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a64aa4d955630e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-23 09:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab738f8fe77659c7fd4fa09cd2d28b6 SHA-1: a4e3cd0b30944c98a12ce174042012c67ea8c03e SHA-256: 55a64aa4d955630ef713bf273161c0a45b3a2fd0580fcaa7e59bb512f4b6a129
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links, suggesting a coordinated effort to redirect users to potentially harmful content.

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=application+format+for+school
    • http://rimuv.emilynemchickediting.com/uploads/1/3/0/7/130775129/ecfdb64f7d0.pdf
    • http://jafeva.thundercon.org/uploads/1/3/0/7/130775085/3762907.pdf
    • http://mixosa.usualumnibookstore.com/uploads/1/3/0/9/130969723/dorosufel.pdf
    • http://files.cardiganridge.com/uploads/1/3/1/8/131856276/b800d0630cbc8.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/88719580153.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/xanivutevozamegoguwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8669/3023/files/zikujixigabasebediliw.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/sifobafure.pdf
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/dolokawepuraxiruzas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/44473682799.pdf
    • https://cdn.shopify.com/s/files/1/0434/4152/0790/files/89870355125.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/roxaset.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/sijunegurezozena.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/wezinon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/rimuzufame.pdf
    • https://cdn.shopify.com/s/files/1/0429/1998/5319/files/68041764796.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/53734857415.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_off000069eb.bin
e57c1aff4b756b3afdfe424f70cbccdfc1bcb65c24f7cfc34bd8278f8ddee015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EB 5244 bytes
font_01_sfnt_off00007b8a.bin
05b237c1bb6fe62d9a968e481cdc955bac8969d0108ded0eda73962983dafffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8A 10296 bytes
font_02_sfnt_off00009ee9.bin
32544ef6a3bf278c032dc7dd9c55ba4564282b3f8aca4aa4964e6eeb0691717c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE9 3748 bytes

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