Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a828df33fe28b2…

MALICIOUS

PDF

42.6 KB Created: 2020-08-11 21:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee3ee9b981c42f64b6755896e8d6f904 SHA-1: 3e9b0f2fe5e04473264de32d94be085912e6f939 SHA-256: c8a828df33fe28b25c3330926554a316fc978147d14180b0de616d3190fb3e5c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=adobe+pdf+browser+add+on+internet+explorer%2529', is designed to trick users into downloading further malware by impersonating a necessary browser update. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly indicated maliciousness.

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=adobe+pdf+browser+add+on+internet+explorer%2529
    • http://wuremagi.waylonaussies.com/uploads/1/3/1/4/131454065/f9eabb06.pdf
    • http://files.godorabsurdity.com/uploads/1/3/0/7/130740391/giradam_lazemalowa_rafukada_mamigovar.pdf
    • http://files.carolinemiekinaillustration.com/uploads/1/3/1/1/131164081/6229087.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/62614850587.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/15841425870.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/36373808046.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/change_to_word_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/78564903674.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/aghora_1_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/punijud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/support_vector_machine_python.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/26670687675.pdf
    • https://cdn.shopify.com/s/files/1/0437/3364/7525/files/calendario_serie_a_completo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0532/8034/files/jedujajadori.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/local_anesthesia_composition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/wunowiripafegoda.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006758.bin
1a355e49963d16df91638c99e1aaceb5e2a477ea99e508ffe2b0157b25174c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 5400 bytes
font_01_sfnt_off000079dc.bin
44cc085464a9e191003d5037ca23fa47c44315229176fefcb4017ae7f88ba676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 10812 bytes

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