Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b41b124105b717…

MALICIOUS

PDF

44.7 KB Created: 2020-08-15 04:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b2b6e3d33ed04410b99c9edbd2dc20e SHA-1: dca27108037025c3080ed50c685b26adc156b0e2 SHA-256: 61b41b124105b7179bc0aced4ef0877dc1336ebd6cfaaf229de6258caf2e8bc0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a remote support tool lure. The document body and embedded URLs reinforce this by directing the user to download a remote access tool. While no scripts were extracted, the presence of malicious links and the lure suggest an attempt to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/pify?keyword=http%252F%252F+android-+remote.+com%252F+setup.+html
    • http://files.idslsuppliesltd.com/uploads/1/3/1/3/131379680/lurow.pdf
    • http://files.davidfullerentertainment.com/uploads/1/3/2/8/132814343/7240146.pdf
    • http://files.kobasfourpawsinstitute.com/uploads/1/3/1/1/131164067/549698.pdf
    • http://files.thestore99613.com/uploads/1/3/1/4/131414743/387fd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5221/9030/files/faux_amis_anglais_francais.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/67041107408.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/bidirectional_visitor_counter_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0451/8307/4455/files/furujimosenopoxal.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/bra_ket_notation.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/kannada_english_dictionary_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/vejebovazafezulopulufisuk.pdf
    • https://cdn.shopify.com/s/files/1/0447/4516/2903/files/88132771312.pdf
    • https://cdn.shopify.com/s/files/1/0440/3573/5717/files/47922785806.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/tunefowojugafewamolubuvik.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_off0000705e.bin
d0944f082ec477da95cde3f2cdfefc2c7d18f359d2530a9ed37255d0e564d1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 5376 bytes
font_01_sfnt_off00008280.bin
61c00bb7e0c773be375a00e21ace8345c188421e5aa688f55db8d4e5aeb0b70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8280 10212 bytes

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