Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7c725a5fc8ad10…

MALICIOUS

PDF

46.3 KB Created: 2020-07-22 02:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1fcfd2524e4e982ecec7545f11b144 SHA-1: ab5ac9072f3ec058e5d186bfe1bbd96e5aa726cb SHA-256: 0b7c725a5fc8ad10f2fef5bfa11531a090dd968eb757f46e48f9d717947b8c68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the presence of a link farm suggests a phishing or malware distribution attempt.

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/wb?keyword=multiprogrammed%20batch%20system%20pdf
    • http://files.maryhagenauthorromance.com/uploads/1/3/0/7/130740097/941d132e556.pdf
    • http://files.cresaptowneagles2883.com/uploads/1/3/2/7/132740285/6627144.pdf
    • http://files.websitetemplatesdesign.com/uploads/1/3/2/7/132712120/e9def052.pdf
    • http://files.vgctrading.net/uploads/1/3/1/4/131438509/nusutizu-rijudigurezan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/mutogomesofetuwijozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/56269925624.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/88945979599.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/koxabibekuwerurogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://pezufonitibi.files.wordpress.com/2020/07/64135034269.pdf
    • https://tesodufow.files.wordpress.com/2020/07/13063315068.pdf
    • https://keronurefaze.files.wordpress.com/2020/07/59723711299.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/dejoxexejimela.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/zewokobol.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/60712520634.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/21991092216.pdf
    • https://cdn.shopify.com/s/files/1/0433/2532/5465/files/dotefonafofutexafotoru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/31611273668.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9116/files/dujojitekop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5534/8888/files/mokoxulof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/68224382843.pdf
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/52317380619.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_off0000777d.bin
03ff838553a12604140056856bc0db218cf472f44a410423f3478d0ceafc10b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777D 5592 bytes
font_01_sfnt_off00008a8b.bin
b728f4cadcd636d0de0e1bbab4d7ebb406d14852312856214b553dec85bb04bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8B 9540 bytes

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