Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecf8ac76e325afc…

MALICIOUS

PDF

36.2 KB Created: 2020-08-11 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3b87452f2e5f37bbb986e111b9ca2c SHA-1: dead146d4cb19104aea37f18e3a0f48af3416267 SHA-256: 0ecf8ac76e325afc97454d09487f1aed1f8bdd72924b34837ac7ee0279fad2f5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting an educational topic ('Excel advanced skills writing workbook year 1 pdf') and includes the primary malicious URL. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document.

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.cc/pify?keyword=excel+advanced+skills+writing+workbook+year+1+pdf
    • http://mozivomi.lifeboxusa.org/uploads/1/3/1/0/131070476/sevaxaduv.pdf
    • http://files.meganartandphoto.com/uploads/1/3/0/9/130969934/6e7c20bf6c3.pdf
    • http://files.blueskyestore.com/uploads/1/3/1/6/131606745/044293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/bus_architecture_of_8085_microprocessor.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/62865058561.pdf
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/dewolubug.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/99252460854.pdf
    • https://cdn.shopify.com/s/files/1/0429/4216/9244/files/rukidim.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/jizef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/24801835621.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/gmat_official_guide_2020_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/risoduvusuvisexeviwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0285/files/urc_8820_cisco_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/miseped.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/solitaire_cool_math.pdf
    • https://cdn.shopify.com/s/files/1/0428/1348/9318/files/paradiso_perduto_di_john_milton.pdf
    • https://cdn.shopify.com/s/files/1/0436/9347/3947/files/83206959533.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/past_simple_present_perfect_exercises_macmillan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e58.bin
4d20b251e188f798dc2d894086f478c658bbf72b0e044947598bf1da93c88f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E58 5860 bytes
font_01_sfnt_off00006272.bin
ce526c0866aae671b2f762459a4c09002371fd92f1d3c048f6934a9360fde98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6272 9680 bytes

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