Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd39bfee3c4ddaca…

MALICIOUS

PDF

61.4 KB Created: 2020-09-05 17:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3309fe192ba9b7cd06393aeb1d6c81c2 SHA-1: 706d4606e88617a93d8bd44aca29df6ff987c77d SHA-256: cd39bfee3c4ddacadb4056227f99ceedb03cfbbd1ca849efc978a8aa3e2be2f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=atomic+theory+timeline+questions+answer+key In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/b8c837_21cc0cae5a5d426ca3d9d6962460034b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c0518c_89bb562d558b47eeb7e280ee186cc023.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/286fb8_75b6537d7d88412caf601503f3ce4f98.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0f5b72_639526169a3942c69209fb009aecb949.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/02af14_5ffdb18659e742328c44b3fc537156df.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/72b0e7_d000b5e1d8b24bea84bd9eb1128f312a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2994dd_f6b0974c3bb04b99b959960530008ddf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/afe78f_89e973da3eda4e379d85546165d937de.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/aristotelian_logic_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/3843/6516/files/algebra_and_trigonometry_ron_larson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/82410953790.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/buchheim_die_festung.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/xaxegujuza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F1 5296 bytes
SHA-256: 44635e6712ad459b9a5d6fd252ae5d84fbf16d5031bfd8941f29fcf20c57ba10
font_01_sfnt_off0000b7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 10012 bytes
SHA-256: 6e756005f0782ff3e1601da9dc889e4b28be879e48f924d8643191572543afcf
font_02_sfnt_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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