Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6d39eca5130c53…

MALICIOUS

PDF

51.8 KB Created: 2020-08-05 01:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d467a2e596983d47580a6895914c52 SHA-1: 3ab00051602aa9f284935070d29cbafea4f0e247 SHA-256: df6d39eca5130c530ac940c8348a503b00c6ea4f0c6ad5f880b5d451b9a889d5
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded external links. One of these links, https://ttraff.com/pify?keyword=le+dialogisme+pdf, points to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests a link farm or redirection scheme designed to lead users to malicious sites.

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=le+dialogisme+pdf
    • http://files.liapinelli.com/uploads/1/3/0/9/130969592/relajepazezusivodo.pdf
    • http://files.leisuretravelplus.com/uploads/1/3/1/3/131384432/5756364.pdf
    • http://files.thehyggechalet.com/uploads/1/3/1/4/131438282/645576.pdf
    • http://files.wholeheal.co.uk/uploads/1/3/1/4/131453291/botonevugot.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/81871365899.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/gasigama.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/solijimofemoxejizibuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/77527649945.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/koxolejivafafuzixibakeda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0706/files/vozidanazina.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/lederovelojijumowisupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/429496562.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/kabetiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/pune_to_goa_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/2539/8945/files/concise_biology_class_10_icse_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/mupemelewuxoguraku.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_off00007c02.bin
8d147548ca2e1d726ef8b89e48c2dd42b54bb6b00bba421258ff7a4e1e84aab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C02 4808 bytes
font_01_sfnt_off00008c6d.bin
87a17bea7233261157920997ca7d4def2b3f4362c383a8c45a0c5f2fa77a60f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6D 12344 bytes
font_02_sfnt_off0000b2ed.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2ED 4324 bytes

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