Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae338f1c6c36ce5…

MALICIOUS

PDF

36.2 KB Created: 2020-09-03 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19319d4de0e3f309e3cee12997d714c5 SHA-1: 55a2154661bac8a8970a6d28a41062e332dcfb59 SHA-256: 0ae338f1c6c36ce56bf260bb2d1abd35bb0b0815294a9612fad90178d65a40c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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.ru, which is likely the primary malicious destination. The document body, though heavily obfuscated, contains the same keywords as the malicious redirector URL, indicating an attempt to disguise the malicious intent as educational 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.ru/wix?keyword=kindergarten+worksheets+lowercase+letters
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/81234094734.pdf
    • https://cdn.shopify.com/s/files/1/0444/6827/3319/files/advanced_excel_training_module.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/lilokezifewosojet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0448/1892/3686/files/bytes_to_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/nuvarepunimivusumune.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/dotafupinovolidowuwos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/42767079026.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/xezakexavuzakalofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1010/files/jitolekutetofopafotu.pdf
    • https://static.usrfiles.com/ugd/1b7c00_5995ad16b37540c397bcc1061eb1291f.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_2ed909cce3974e14904c7a2d3f2b7d82.pdf
    • https://static.usrfiles.com/ugd/04e6f9_be79d7a8a079424c89254b584bd09a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_949bcddcbd734bbcaf75a39819f57f67.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a23793e39214501a84623e8fb0e75d6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f50.bin
adaa89c13ddc37cbf8ad167b327d389cd133f12f98fa668010c9f76ace27de42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F50 5328 bytes
font_01_sfnt_off00006178.bin
a61be6aa7334cbf07271a983b246de3f4e5646cbae3d2b5315da48492875ae49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6178 9968 bytes

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