Malicious PDF — malware analysis report

Static analysis result for SHA-256 00491bd858f36ebb…

MALICIOUS

PDF

44.7 KB Created: 2020-08-30 12:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c6b1f6be235a483bd9320299c25d9d7 SHA-1: 75a78c9fba137a504157ee9899cb21bc80cc2a0c SHA-256: 00491bd858f36ebb017c47f6d20ac60ed3b139ab870add13e9cb04fce4bdcaca
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.com/wix?keyword=libros+budistas+para+principiantes+p', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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=libros+budistas+para+principiantes+p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.pdf
    • https://static.usrfiles.com/ugd/912de2_5c5043adde954e2d911b5ccbfa7e7d5c.pdf
    • https://static.usrfiles.com/ugd/238140_f77351f8c1fc4e489a8fdb39d6b6cd13.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/24179997429.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/86164480123.pdf
    • https://cdn.shopify.com/s/files/1/0457/4612/7004/files/dejek.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/ielts_academic_writing_samples_band_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/xekajugewamuzapun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/wilobunorevudiwozejim.pdf
    • https://cdn.shopify.com/s/files/1/0437/9652/9313/files/excel_and_succeed_biology_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/cambridge_english_empower_c1_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/alphabet_pictures_for_each_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/fifufa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/fosafutevikibalu.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_off00007036.bin
816fdd0560df7ebb57ee3e199dd27a9259af81b374fc2f9b0767c64a74efdc3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7036 5116 bytes
font_01_sfnt_off00008196.bin
d122133b545d370eaf5d4274f063c5b380c0ac7e3be87489a2edaa7983b52875
pdf-font-stream PDF embedded font (sfnt) at offset 0x8196 11184 bytes