Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c730c5b2efe52fc…

MALICIOUS

PDF

62.4 KB Created: 2020-08-31 10:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14feacd6055317b93d6c12105cbc0e60 SHA-1: b4455e5d38570697a89c03ccdb23e691e15dc0d6 SHA-256: 1c730c5b2efe52fc677f6cedfdc8444d489d696362a0003e5bcce0b041c9bfd2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to other PDF files hosted on Shopify, characteristic of a link farm. One of these links, 'https://ttraff.com/wix?keyword=las+adecuaciones+curriculares+garcia', is flagged as a known malicious redirector. This suggests the document is part of a campaign to lure users to malicious sites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=las+adecuaciones+curriculares+garcia
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/bozazola.pdf
    • https://cdn.shopify.com/s/files/1/0431/2586/6662/files/63774662827.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/71487268329.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/delobonopokilowa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8104/0033/files/44669880828.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/can_t_help_falling_in_love_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/bible_niv_1984.pdf
    • https://cdn.shopify.com/s/files/1/0461/6306/7032/files/zamulisajegumubetosoroxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2854/5693/files/79924246122.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/quantitative_data_analysis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/lettering_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/borenatokobi.pdf
    • https://cdn.shopify.com/s/files/1/0451/1550/6853/files/99925380607.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/99841347871.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/98020759686.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a833.bin
e2251b255e7e48cb0b5f9614a5ad0491e7d452595576f7e7d21566d5ce7f4b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA833 2300 bytes
font_01_sfnt_off0000b297.bin
525ac455946749b7faf2f428ca5f69f184ddcb62ba11aa97851532e25b7ac9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB297 5048 bytes
font_02_sfnt_off0000c3c6.bin
001e88beca5d3e31681c63301dad1e1063ef3053759b20f4e084f919b6b3a677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C6 11972 bytes

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