Malicious PDF — malware analysis report

Static analysis result for SHA-256 482e3598221765ca…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 05:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d71ca9a3e91d4f6118f8f284d5ac193 SHA-1: bb188326f5675f6d3c2be0e58408468df43743d9 SHA-256: 482e3598221765caa50799aa0b5ac69273598310a6ed0218b1cf0967086aef4f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a redirector URL, and 'PDF_SEO_LINK_FARM' indicates a mass of external links. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful 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.cc/pify?keyword=code+formatter+online+css
    • http://guleno.biosciencelabs.co.uk/uploads/1/3/2/7/132710621/vexag.pdf
    • http://besur.music.olswahiawa.org/uploads/1/3/2/7/132740309/gixam_galirerupefet_varuketejosupi_bejareguwute.pdf
    • http://files.ksdgroup.com/uploads/1/3/0/7/130775633/8d36ea91b33.pdf
    • http://files.neilfoley.info/uploads/1/3/1/3/131398560/mekarudus-tugat-raludujaj.pdf
    • https://cdn.shopify.com/s/files/1/0445/6002/3711/files/motorola_usb_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/moseba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/jquery_template_html.pdf
    • https://cdn.shopify.com/s/files/1/0434/2749/6087/files/48825491672.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/intermediate_accounting_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3014/2363/files/5230875995.pdf
    • https://cdn.shopify.com/s/files/1/0452/7416/9505/files/nobobexoloralorisa.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/62930422087.pdf
    • https://cdn.shopify.com/s/files/1/0438/8595/3192/files/87074153683.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/gopipatipuxunojavufil.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/pusibotemijibekimobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5351/files/bedding_roll_for_guide_camp.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab3.bin
97b0d5a1eb06937164ab154d335999d94c8fd85731764890ff5d52ea9e139c8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB3 5072 bytes
font_01_sfnt_off00007bd5.bin
5af5a52b86d94cb4d59c084f62e41373327c16ab221f3e4a026d71d03744992b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD5 10636 bytes

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