Malicious PDF — malware analysis report

Static analysis result for SHA-256 059d578da3905f08…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 14:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77aab5fde69f972b3fbf96447cab6a8d SHA-1: e90b9c49ff897fc2775a8731d4d80ab390f89aed SHA-256: 059d578da3905f088c467c0a1f8b466bda3225e1e0d960489daeef09c8321982
162 Risk Score

Malware Insights

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

The PDF contains a lure disguised as a permission letter to be absent from work, directing users to a malicious redirector URL. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to spread malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites, potentially 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=permission+letter+to+be+absent+from+work+pdf
    • http://files.lauraspreciouspomeranians.com/uploads/1/3/0/7/130738769/tuduxafatid.pdf
    • http://files.addylucandles.com/uploads/1/3/1/4/131411088/4e167.pdf
    • http://wagelen.ieperiostudyclub.com/uploads/1/3/1/4/131483083/3748886.pdf
    • http://files.reedsburgambulance.com/uploads/1/3/1/4/131409200/0d488f139c7a5e.pdf
    • http://files.justicefordrew.com/uploads/1/3/1/3/131384709/fowoxitizuwobudu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/14979721982.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/38154798159.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/kijasazawijowatosom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8151/files/kansas_sampler_olathe.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/timadaweputigiteludirenif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/a_first_course_in_abstract_algebra_fraleigh_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/pamiganotenowunexugofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/alcoa_fastening_systems_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/applied_microsoft_business_intelligence_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/28308920293.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_off000065f4.bin
9e59bebb1f3f1a7124b21cdd67e8f13d492e91e5598245bd9bc3e8f78080cac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F4 5484 bytes
font_01_sfnt_off00007885.bin
58f5f0f5594f175773240fce7a608350844b4a5964c379c9eb5b8d1b52cbb26e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 9972 bytes

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