Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da94940be5e9833…

MALICIOUS

PDF

40.7 KB Created: 2020-09-04 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2c0fc5e1a29480d32cf95ad317f3cd9d SHA-1: 3480c52a557a463490a1b95263d10444fb0d48c3 SHA-256: 6da94940be5e9833bdc3f06a19d1a042a9b1a8ec5a9e0e135b12f546e69f6721
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, suggesting a social engineering attempt to lure users to malicious content. The document body, though heavily obfuscated, contains the primary malicious URL. The SE_CLICKFIX heuristic indicates the document may also instruct users to execute commands, potentially leading to further exploitation.

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.me/wix?keyword=minecraft+pocket+edition+mod+aptoide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/451461_c751bcf065094b0cb135f76b9b8992a1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6a44d8_92eb51ec947043d6b6ece150c5f4d565.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/314c35_aba544a7b7764b8d8f166bf3d716ae61.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_33d8c61b388f47fc97ebbf1c00f5c01f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/daca0d_aab57212c73245a395f39dffb0994dc9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/8981/1614/files/89584713160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/pneumatic_valves.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ad2ade_c07731c545954367a6cf3c192f3f8cf7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a6046e11e01d4364a2d3219de7610d82.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7f16bd_00e2a363d2814cfc8c95fec438cc4775.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6da380_e2582e90348345c89e1d9ba10ee21590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/fairy_tales_story_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/cool_basketball_wallpapers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7317/4680/files/93120161925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6973/0979/files/ars_poetica_staff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/rivoposufewajixifedaferu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5160 bytes
SHA-256: 82b21e7b05741a0c1e078322a2c4f925ef759e46b87939feb6efbbc8df0c50e8
font_01_sfnt_off000072b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B8 10276 bytes
SHA-256: 1ef0302cc0624ff91b5adba7c365e54c4ab8a0f1ac8ee8b2a069c03aa86cf5bf

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