Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6b9c5371386f9d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c8a4fb63d8b8af88c67872273c1aed SHA-1: ee9413bcad904850bf6ecd37c0f67d051f8c70f8 SHA-256: ab6b9c5371386f9dbd737fb34bc36568ff2bea88719973cfc22807f392ab3f57
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, indicative of a link farm or SEO manipulation. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of the malicious redirector URL suggests an attempt to lead the user to a harmful destination.

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/pify?keyword=ancestral+house+music
    • http://files.jandaministries.com/uploads/1/3/1/1/131164479/figijewed-lewik.pdf
    • http://files.emanuelaaureli.com/uploads/1/3/2/3/132302710/3397372.pdf
    • https://cdn.shopify.com/s/files/1/0437/3748/1365/files/widuxedeje.pdf
    • https://cdn.shopify.com/s/files/1/0438/8293/8520/files/master_of_money_sunday_adelaja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1538/8840/files/english_news_paper_download_today.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/fogelutosejovutoge.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/fatenavovofibebifegosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8182/files/wovasizegamok.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/xobagipenawufemasalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/12th_class_chemistry_notes_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9249/2963/files/20222377182.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/acc_cement_annual_report_2018-_19.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6773/files/degafalotikozaxir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/alphabet_book_template_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005993.bin
dc136a8bf14bc4c473044647df7d00a34fe63b42f75dd94619624a8033ab9253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5993 5028 bytes
font_01_sfnt_off00006a67.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 1800 bytes
font_02_sfnt_off000072f4.bin
eef2109a6c1b48a420dec629444d7f84d1c695a5a1b4a42741e8185d4c755d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F4 10692 bytes

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