Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22b27f1181203d7…

MALICIOUS

PDF

40.5 KB Created: 2020-09-05 16:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc0d6de292c4373b6819cedd1e004a6e SHA-1: b0137e0ac372f18ba97f146ef809f2b88f98c08b SHA-256: d22b27f1181203d7a8554e82654067722ba06c392d78eb687ae1450286da47db
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as C aptitude questions, which redirects to a malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.link/wix?keyword=c+aptitude+questions+with+answers+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8092/5594/files/76311897342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/imperative_worksheet_for_grade_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/kevuki.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d1c05f_5e81875bbf3849f9b71862c8f5a15ae8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d8966e_30eb2cf6f60d4e378a42073fed7f8979.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3d0627_22a336476c394469aada3cd91368d5ec.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d902bb_18ecfff554894eaab310f21b04786fbf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9ff9b8_853d69d0a1f348e99765c18605b0860d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6faa324095fc4f1093127f55ec6fec03.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9f69bd_a1b5bae223d847e6b8b4939350729174.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/28b3f7_c3d4eeecc6c64007b665dafe2317b713.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d8f7d119cd7a4af69d3d0cf4b5e29ad9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/432b07_5204a1fe62b24cedb856aa7fcf4762c0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/510691_ff2dab5250c24bcc838d98fcd019ed3d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5dc3ca_5200e61302904c8683f708030ce00572.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDE 5220 bytes
SHA-256: e18036d387a853686f57fb368cebf4bb4df0ae1ba8c59268af0b2c5cbd149e1d
font_01_sfnt_off000070a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A8 10640 bytes
SHA-256: 0a968138c9e2be60bfe8540db094d70a87a8c649de2da906c48709ae24bb8ae2

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