Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6a67c9eeb7aaa3…

MALICIOUS

PDF

49.1 KB Created: 2020-08-27 19:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e199ce986cd9ea0749d3bdbe118f5159 SHA-1: 41d1bae7cb196a9d630775632aeb91cac585c3c5 SHA-256: 2e6a67c9eeb7aaa3ac9deb48d3f63768a4fe46bcb2383fc30a0d03c0e6dccbca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, as indicated by PDF_SEO_LINK_FARM. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=10+candles+rpg+rules
    • http://zofix.ggcasimiro.com/uploads/1/3/0/7/130739704/jojaduruneludofowa.pdf
    • http://rinep.oriontrainingsystems.com/uploads/1/3/0/7/130775374/nepososorupuwefax.pdf
    • http://tuwaded.lacharite.net/uploads/1/3/0/9/130969596/62600a59b3fabe5.pdf
    • http://files.sixthscentsoils.com/uploads/1/3/1/4/131437107/8996814.pdf
    • http://fuxukoso.dfirprofessional.com/uploads/1/3/2/7/132710621/9318d37d83a50.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/zivefalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/29172176018.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/41365495812.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/soxulofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/munuwapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/zepivugitapirapid.pdf
    • https://cdn.shopify.com/s/files/1/0465/0595/1390/files/geter.pdf
    • https://cdn.shopify.com/s/files/1/0430/8244/9045/files/ase_a1_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0213/4681/files/basic_sales_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/mindtap_principles_of_economics_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/fefijinazuxuritadega.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/niwadajupepipopewikaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/cavernomatosis_portal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080b0.bin
31c27ffc9ad21d9abdec94850151f06e239b0dbd9f53f597adf56ae50a5f33a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B0 5340 bytes
font_01_sfnt_off000092df.bin
e3faf84e7c8fef49767e01f9d99a17e8dde9af3fbe0fdcde70662dbdafd585f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DF 10664 bytes

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