Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d3aea2a8e25eef…

MALICIOUS

PDF

36.8 KB Created: 2020-07-17 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: dac0cbeea49924746cce0732001026fd SHA-1: 17010a4ae0aafc72dc654fea3c499e46dd90bfbc SHA-256: 13d3aea2a8e25eef88f9c86e519b2cdc3a9175b637e4b83054758a20398e9391
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a malicious redirector, specifically linking to 'ttraff.com'. The document body, though heavily obfuscated, suggests a lure related to an 'exercise pdf'. The embedded links are designed to lead users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=if%20clause%201%20exercise%20pdf In PDF document text
    • http://files.treehuggersoap.com/uploads/1/3/0/7/130776847/lenejoxijunapemibuba.pdfIn PDF document text
    • http://files.sarahabel.com/uploads/1/3/2/8/132814272/vawivuzebopade-xuvuvevipa-mafelitaba.pdfIn PDF document text
    • http://files.twttoa.com/uploads/1/3/0/9/130969497/tuwolibesab.pdfIn PDF document text
    • http://files.liic.org/uploads/1/3/0/7/130738719/tasowog.pdfIn PDF document text
    • http://files.millwoodchurchofchrist.com/uploads/1/3/1/1/131163969/6590990.pdfIn PDF document text
    • http://files.cindytempleton.com/uploads/1/3/1/4/131406663/nabimazineximagofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bowamupodi.files.wordpress.com/2020/07/69797627696.pdfIn PDF document text
    • https://lifekatido.files.wordpress.com/2020/06/60017326123.pdfIn PDF document text
    • https://vefutoval.files.wordpress.com/2020/07/95659432323.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2258/1923/files/ruzijosovaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6936/4632/files/39367000431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/92812043599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/87819282029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1213/6855/files/56268842206.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/31271292713.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54B7 4792 bytes
SHA-256: 2c665ca93309cfdafed9fa2b81ce3cda40160b4c2d4959a43a5e97d0e360e0cb
font_01_sfnt_off00006513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 9724 bytes
SHA-256: d8cfe1bffe587d055f0dc2ebf1b23a2050d6e90a003af94b754e94370abc0de2

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