Malicious PDF — malware analysis report

Static analysis result for SHA-256 310fd82727fbd25e…

MALICIOUS

PDF

36.0 KB Created: 2020-08-31 08:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39cd3eccea11bd981fb62374396ebca SHA-1: e6e93f61db8c8308dbc0733476701a6e540213cb SHA-256: 310fd82727fbd25e60612472e65e90d2d0ebe9ab58adb334ff7f4cf4660be81d
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common technique for SEO poisoning and redirecting users to malicious sites. The primary malicious URL, https://ttraff.ru/wix?keyword=chhota+bheem+movies++mp4, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the search query and the PDF creation tool, suggesting a lure to external content. 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.ru/wix?keyword=chhota+bheem+movies++mp4
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/sebafanufasifewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/sufivimibedumaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/pof._com_deleteaccountb._aspx.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2186/files/1866151827.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6226/files/3036702464.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/sigeradedasudexuximajeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/99367361369.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/xozutigeboxikigikike.pdf
    • https://cdn.shopify.com/s/files/1/0433/8479/9383/files/bethel_school_district_v._fraser.pdf
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/jejatifurokenevevora.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/wotakovopejepalogak.pdf
    • https://cdn.shopify.com/s/files/1/0440/7581/0966/files/descargar_corel_draw_gratis_en_espa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/kaxodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/format_sd_card_windows_10_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/viwavuwopijixe.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_off00004f4e.bin
cf3c22022f6f4372a69cb54d75a1a11e3b1641b456e85681ef2ecbe0ae30a61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4E 5124 bytes
font_01_sfnt_off000060a6.bin
ef0d7bad93baabf7921fa535fc72d591a698e6a05026337269cd5f774cd1be3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 10148 bytes

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