Malicious PDF — malware analysis report

Static analysis result for SHA-256 7857bef8077f89cf…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 08:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 132d143fe45fdaf94baa7905f8617abe SHA-1: 118adfaab0383353590cf4401d4c753d52d64c54 SHA-256: 7857bef8077f89cf3e400bd37dbf07b8de763befca9608e59e1fc011ee444335
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Synonyms list for ielts pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates a phishing or malware distribution 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.cc/pify?keyword=synonyms+list+for+ielts+pdf
    • http://zufawime.cescroca.com/uploads/1/3/1/1/131164250/venafuzaxigavak.pdf
    • http://files.kansas4apowerlifting.com/uploads/1/3/0/7/130775277/jufezurim-datex-zofofovexi-tuwixemegodete.pdf
    • http://sumefiwu.uticaforall.com/uploads/1/3/1/8/131871390/5945b201.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7358/files/76978187120.pdf
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/27640284724.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/fojanevotaliwijewuvavot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/blender_2._8_modeling.pdf
    • https://cdn.shopify.com/s/files/1/0428/5458/0390/files/norton_anthology_of_short_fiction.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/wojenixexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/39395026888.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/19667176868.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/vijojanufinarisegakeze.pdf
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/ramuwifoxivukuremapiked.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/vobari.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/php_array_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/kujokusosujutatowonozas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/mipusodosawiju.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_off00008092.bin
858aa5de3cb2105875a29f6cfe74aa63ce9cc25a1e3717f2a82de21da5085aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8092 5184 bytes
font_01_sfnt_off0000922b.bin
e4cd402c575fe1ed7d2345be650f9a9593392cfff1f6454ba91feb37bce820fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x922B 10528 bytes

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