Malicious PDF — malware analysis report

Static analysis result for SHA-256 6820272823e58fd1…

MALICIOUS

PDF

42.4 KB Created: 2020-09-06 09:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf4ea224bae1cd02676f7b7b5efb71e0 SHA-1: b7f098d3a35a27a51c59a282eff56ca8ec1dcd37 SHA-256: 6820272823e58fd1fa05b825b4809b951afca7ce003a924f4ae6c48aad032a26
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though obfuscated, contains text related to job interview questions, suggesting a lure to trick users into clicking the malicious links. The presence of numerous links to external PDFs, some of which are benign, indicates a link farm strategy to obscure the malicious destination.

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.com/wix?keyword=difficult+questions+to+answer+in+job+interview 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/3b0c81_77ee39b78c34460a8af174eec0c45af2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cfa91a_e697778bf44449d2aa436fe329376f3e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e7e4a0_255e3b69bd6a426880f3b2eb31864811.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/79e5df_7d05928715d34e88a07436ab824a7e99.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_108fc8ab29a64a10a410ea0c5d2b291a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eed56f_238437c6f4d449a386e79dc22a28864f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/191a6d_632abc4182a9490eb993853e4b48d4a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/69695d_f642e33f8a3742ee80e806dd4a626f79.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a64c8c_fc1c3d22b9994c53bc7b732852d5bfdd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a58b01_73aa0692dbb14506b66a6636b80188a8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/ronson_universal_gas_lighter_refill_data_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/ragnarok_eternal_love_leveling_guide_80.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/textbook_of_systematic_botany.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/worumominosolasiwiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/3608/6172/files/a5_flyer_template_word.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_off000065dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 5368 bytes
SHA-256: 9c408b9f839e4e4d25d51d353bc91e7b4d3d2c497e4bd3a7e08ec9ad5c7fd864
font_01_sfnt_off00007858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7858 10612 bytes
SHA-256: ed17de2bd4e3551de93a1933fa06aa4c252b1abc828ee3e969ccb9813a4f6e67

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