Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69676ba129e49ad…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 21:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db99d62d522a9d98c81b9a0c9b024ccc SHA-1: aedded33fd4fe591f5ad7ad5613b8dc1fc27ca47 SHA-256: c69676ba129e49adbf92ed9568b40d8cb05ed6d770cd6d881d87f4799e95c526
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'barcode examples pdf' and includes numerous URLs, with at least one, 'https://ttraff.cc/pify?keyword=barcode+examples+pdf', identified as a malicious redirector. The primary attack pattern involves luring users through these links.

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=barcode+examples+pdf
    • http://sinovofeb.bentail.com/uploads/1/3/0/7/130775379/1020415.pdf
    • http://files.kylaslab.com/uploads/1/3/1/1/131163851/3920866.pdf
    • http://files.nanostitchlab.com/uploads/1/3/1/3/131380440/6916303.pdf
    • http://files.bluevista725.com/uploads/1/3/1/3/131381095/5070035.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/marxist_approach_to_industrial_relations.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/sejukobipudunatex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/85783801759.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/64182055327.pdf
    • https://cdn.shopify.com/s/files/1/0429/6015/8873/files/ronupolimezeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/vunemejenajafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/wiki_wiz_khalifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/tufadegufor.pdf
    • https://cdn.shopify.com/s/files/1/0435/2131/0875/files/42046868959.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/25873417731.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4592/files/javodiroza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/network_cabling_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/bitufegewudolajatimifosik.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_off000062fd.bin
4043962e09ca6ca946b5f65a6c0db5da228e9fc01ddb189050e074eba371fa21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 4972 bytes
font_01_sfnt_off000073e0.bin
5831648ff33901e32c33f57ddae288fb78bb57406cd9e1d30abf54c85b7f7646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73E0 9968 bytes
font_02_sfnt_off00009611.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9611 4324 bytes

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