Malicious PDF — malware analysis report

Static analysis result for SHA-256 83556ea550319006…

MALICIOUS

PDF

46.7 KB Created: 2020-08-07 05:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e6faccf0d3a9f94aa0b13838af0fd83f SHA-1: bd425a0fbdb94f63d7b7d739a89ac090fad6dd02 SHA-256: 83556ea55031900622282924cffc6e33593830e579ddf7865792de0fa0840397
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to host other PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded links suggest a phishing or redirection 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/pify?keyword=audi+a3+price+list+pdf In PDF document text
    • http://wawukegi.thesociologicalcinema.com/uploads/1/3/1/4/131453329/bizop.pdfIn PDF document text
    • http://files.budgetweddingsingapore.com/uploads/1/3/1/6/131606362/9810309.pdfIn PDF document text
    • http://files.mail.stthomaskids.com/uploads/1/3/2/7/132740285/d5038eaaf1.pdfIn PDF document text
    • http://supopoxe.lilyandbangbang.com.au/uploads/1/3/2/6/132682646/2642281.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/tufosedujabajebuvesumetif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7141/3151/files/javalamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/95025633991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8342/2109/files/affinity_designer_workbook_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/39120552683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/73119555962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/43248491785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/45479380024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7936/7845/files/mefedepegak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/51002163078.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000618b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618B 4968 bytes
SHA-256: c4c538983dfd05c3921f5fa3f8e6311cab0de0a28b46724846ef54ff26a69244
font_01_sfnt_off0000727b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727B 14676 bytes
SHA-256: 735b763481843a62ce820949dacba911aa4931df3b6d9c40fb89a49d63315df8
font_02_sfnt_off00009fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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