Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f40668957b8b0cb…

MALICIOUS

PDF

56.0 KB Created: 2020-09-08 15:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d868abcaad4c8f7b95d81b88a9834e12 SHA-1: 3527dbbd9bedb465bb1750c64ef1f1fa7b17cce5 SHA-256: 1f40668957b8b0cb293f1e17795d043d737270a286eda8ec446ce98dd2b8c568
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector at 'ttraff.com'. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=exponential+inequalities+worksheet', indicating a lure to disguise the malicious intent. The presence of numerous PDF links points towards a strategy of distributing content through a network of linked documents.

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=exponential+inequalities+worksheet In PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/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/c162b3_ca670cb548f94e4fa532329f5989e35c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/40512e_a462ba9a240e4de9ad28fbea2f51161e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cc572_8f16f00c23bc488c9ec03904f43d38c5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/822ecd_f3da5071616445bbbaa1852dace9041c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/38955b_9dd99a55167e4d768cad86d1e078c8d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de60da_9747afa108ad48f6960ec35a6358a16d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b4a829_f3a4b134c6be4d3ca0e527002a102203.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/11baf9_8e9a9b1709f84fa39c285efcf5cf367c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5ea691_fa9494a022a24ef0acd808f927aa97e1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/868b90_0d0af07ae10a4e42ba1bc87b2676633b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c63dba_8dacebc7969f47e2ad21f0e1d5e36577.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/374ce0_844deea1e90e4b33bf44c94681ecaaa6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3801ff_b4555f4d66a548778465be249ced0983.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1ee69b_b2a4000c55a04fb78409c5d3b7807e4d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0bfb20_a170f44cd64b455faba7c54e1a31609e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3ae4f811cf4746fdb013b52745dcf53f.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D88 6760 bytes
SHA-256: 946a6a3b03d91d51289c9041dd5f373cec9184609699badd169051658879f4dd
font_01_sfnt_off00006e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 5284 bytes
SHA-256: 87b6fd157d963d026e6e51c70f33240d534a821dbd375c505de5529ad21e7c36
font_02_sfnt_off00008249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 5096 bytes
SHA-256: 720fce0b6776de65762a5d2363c4a38db70ef9b8c518a67f99e782e131c6bf2c
font_03_sfnt_off000093a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A9 14720 bytes
SHA-256: e6d48c09a5db778e8169a483aabd2a83f1a991f0ecb6a96e6fabf761aca14fad
font_04_sfnt_off0000c1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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