Malicious PDF — malware analysis report

Static analysis result for SHA-256 773ee7d2761a06a6…

MALICIOUS

PDF

48.6 KB Created: 2020-09-01 02:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11fed6b0d4878c3cdec6002e719d566 SHA-1: 52c3da3980e3d2381419186bb65607e11be602dc SHA-256: 773ee7d2761a06a6d7030d2bff9eafaa4f194b03bd316a7288548f015e402779
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature. The presence of numerous other PDF links, many pointing to static hosting, indicates a link farm or SEO poisoning tactic to improve search engine ranking for malicious 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.com/wix?keyword=tnpsc+maths+age+problems+in+tamil+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/ea5d7b_a1d57acf2a2c4981bee045cf6b947e36.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f7c23fa8fbbb455fa1be984f3de8c479.pdf
    • https://static.usrfiles.com/ugd/dba42a_ebd45d9458d3412bb599f97703c3e45d.pdf
    • https://static.usrfiles.com/ugd/a838c0_346c6aa471d44ad5b00e1c9579d5672a.pdf
    • https://static.usrfiles.com/ugd/47b1e8_3b897cdecb634e9b8cd5908ceecf0674.pdf
    • https://cdn.shopify.com/s/files/1/0465/5785/5894/files/gosafabizulopowabewowuke.pdf
    • https://cdn.shopify.com/s/files/1/0440/5769/0262/files/tepadojeged.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/ps2_co_op_games.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/aix_7._1_rpm.pdf
    • https://cdn.shopify.com/s/files/1/0443/4988/2524/files/naming_and_classifying_angles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/seven_themes_of_catholic_social_teaching_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/dolce_gusto_jovia_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78006bb28264b5698053f9d80368bbf.pdf
    • https://static.usrfiles.com/ugd/efb3f0_4f3634e8a29142588e236b8fd8dece69.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fab.bin
116b1609e2490b1ceb00a6a9ade6d65df4ad7bd4c4d19178fe232238fe07d2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 5660 bytes
font_01_sfnt_off000072b2.bin
d03a10bfd5a3d3c619044a06642d696dd57ca761180817f898559e9e8af0a109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 7664 bytes
font_02_sfnt_off0000882a.bin
9061e02b679071a9b1ea5bebe054dab9d8498ec8a82bfec155c24d81fb64f24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882A 14672 bytes

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