Malicious PDF — malware analysis report

Static analysis result for SHA-256 14656cabc3d86915…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 19:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b05af8665ff70f2e33ea893ebff1f801 SHA-1: 708a5126edb843ae556c4d6fe4d438f3663e0c38 SHA-256: 14656cabc3d86915858a7a450d56b7cbb39567f7f7a387149a80990106f771b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for sheet music, suggesting a phishing or scam attempt. 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/pify?keyword=beatles+let+it+be+piano+sheet+music+pdf
    • http://files.mysteriousdragonfyre.com/uploads/1/3/1/4/131453698/zofodejudasatetedive.pdf
    • http://files.infortifiedglobal.com/uploads/1/3/1/1/131164452/941ff3f3ec5.pdf
    • http://mizamux.auchterandgood.com/uploads/1/3/2/6/132696323/7374970.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/40348087498.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/dujejufi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/59015048266.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5957/files/your_brain_at_work_david_rock.pdf
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/general_issues_on_environmental_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/vajerusesiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3282/1412/files/clinical_pharmacy_and_therapeutics_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2852/files/xodejesunujiwubegoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/aztec_inca_maya_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/install_disk_creator.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/64493833316.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a56.bin
a49fb714bb0e18d790181d5a2e1da8469df1790eda5add52927e4a8992fba015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A56 5368 bytes
font_01_sfnt_off00007c5b.bin
d10ba2e95d4594e85e6db1e2ea80e0e86548192767588038b18a0743672e62b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5B 10720 bytes
font_02_sfnt_off0000a113.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA113 4324 bytes

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