Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaf9a29bebd4cf9…

MALICIOUS

PDF

51.3 KB Created: 2020-08-08 05:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f48596b64b5eab1d2cbf5b2f38a6bb SHA-1: 5d01a7508197e1d4adc3224deff836b86f4b2111 SHA-256: 5aaf9a29bebd4cf993adc0cd2e164088f56adbe545dc986662738c2d62948e47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=lire+journal+el+khabar+pdf
    • http://tarumili.mryeiser.com/uploads/1/3/2/7/132710712/pazemonetuke.pdf
    • http://files.mommywhereismyshoe.com/uploads/1/3/0/7/130739375/fipaluwadin.pdf
    • http://files.peterclarkmd.com/uploads/1/3/1/3/131378943/lomovate_tofoperivuxaze_zogiwabolinim_nexot.pdf
    • http://fujex.amandawroten.com/uploads/1/3/0/9/130969744/f9338d5598d.pdf
    • http://files.johnguillory.com/uploads/1/3/1/0/131070291/kagak_xozoxagiparo_ligabolurodume.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/github_upload_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/fixufijinemazane.pdf
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/dimilezerofifijeleputenot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75609531209.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/manisogegisaminopunugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/xukonasopaginizidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/26914921601.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/tiny_dancer_elton_john_piano_sheet_music_4f9bf7fc-6272-4d78-b8d4-0f7292cbed31.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/fenepetufesogoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/6031648388.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/mixizegokopetobaxarum.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/lezuwinejirolinavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5416/1310/files/2792975935.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000669c.bin
8e01f5046b4de8ce7888a59f9f5799417153ef1884dbd46e594cad9b94a323db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669C 5172 bytes
font_01_sfnt_off0000782b.bin
ba4c5e67bfc4b93f6cbba4a50768b732bbe749c63404fcfe6c3b792068af481c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 10652 bytes
font_02_sfnt_off00009c5d.bin
e613a2491746fb8fa48b9c448f685aff771d4e6d3048556015a6d7563fd41b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5D 20588 bytes

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