Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdb26076aef625b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-23 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c6a3a23f2cd88df1c89fc1a8356bb2 SHA-1: e7893a6cf282ae3cd4ce896bb405ec31d9ca239c SHA-256: 6bdb26076aef625b0ef721b086a4301a6cc80ebc1996fb5ff0b59a3529cbe867
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by a machine learning classifier and contains a high number of external links, including a link to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body contains obfuscated text and URLs, further indicating malicious intent.

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=fishing+report+bull+shoals+lake+mo
    • http://files.rbaappalachianministry.com/uploads/1/3/2/7/132712127/8290445.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/9789852845.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/nebutetetaram.pdf
    • https://cdn.shopify.com/s/files/1/0437/2663/5162/files/zone_assistive_touch_pro_apk_rexdl.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/88273385924.pdf
    • https://cdn.shopify.com/s/files/1/0457/3636/2140/files/madotenivubazozotegeva.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/kefowuteriri.pdf
    • https://cdn.shopify.com/s/files/1/0434/6177/1430/files/lifulawun.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/zokovexotetupixexukilulo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9818/files/59631614034.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/majoworolodoguza.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/bajelekek.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/algebra_1_regents_june_2020_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/29055380136.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_off000069ae.bin
abdd2ee5bf1b038fe8ac40046adf95fa76fbec1914e5fdc73d5bb6b72ffd30a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 5392 bytes
font_01_sfnt_off00007bcd.bin
ffc52edf077f86df203dc8487d669555bd4d76934eae329806732cbbd80266c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCD 10180 bytes