Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8e56e23b7433f4…

MALICIOUS

PDF

49.5 KB Created: 2020-08-19 12:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e09dacd0b99bc7153a4214fc97de354d SHA-1: 998a452825b65a0c38805a3a490c0ec9572465cc SHA-256: 1f8e56e23b7433f4156b503d6b10603715ecfaa1325f60c57d96cdeeed45d036
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests a lure to a malicious site, likely for phishing or malware distribution. No scripts were extracted, and the PDF structure itself is the primary vector.

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=genomic+dna+isolation+phenol+chloroform+method
    • http://files.crtcbooster.com/uploads/1/3/1/4/131437307/1077339.pdf
    • http://difefijew.manningvbsb.com/uploads/1/3/0/8/130814238/xumef_renemep_ramafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3633/6551/files/335657397.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/65035647553.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/87132340383.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5765/files/gesusovapemejulefojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/pdf_import_for_apache_openoffice_4._1_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/64132212617.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/87245577397.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/general_aptitude_questions_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5738/8440/files/gazemilox.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/75547113230.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/vuputetoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/kosewudotowawubop.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/tesuputenibesabimib.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_off000075bf.bin
cc733406072ce4ea05aa23f6c649d3c2959532bf05b15da92d387108b2817fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BF 5216 bytes
font_01_sfnt_off00008746.bin
6f097833187823e80961b42c549e120a235365f1cbdf74a73c3759b1fe2f228b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8746 10340 bytes
font_02_sfnt_off0000aa7e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA7E 4324 bytes

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