Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fddbf36ff07e740…

MALICIOUS

PDF

47.4 KB Created: 2020-08-26 02:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36795ca1adf3b7f51d5ba9ce2277f2c0 SHA-1: 727a13e001a05d3131858112781d6052515a2db5 SHA-256: 2fddbf36ff07e740f6d0cba0e66440500d0d5bce675c70cc5f7b0ff0a5a32f78
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though partially garbled, includes the string 'Juegos de lateralidad' and a URL that appears to be a redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to malicious sites via these embedded links.

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=juegos+de+lateralidad
    • http://xanap.clarkkentcreations.com/uploads/1/3/0/7/130740444/6318805.pdf
    • http://files.understandingfantasybaseball.com/uploads/1/3/0/7/130775448/227ae79f2b.pdf
    • http://sabip.thecarolinacanineranch.com/uploads/1/3/0/7/130776485/44d70aaf1a12658.pdf
    • http://files.vintageglamper.com/uploads/1/3/0/7/130775734/duwujigibajopipa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/4574096956.pdf
    • https://cdn.shopify.com/s/files/1/0438/2995/2674/files/perforated_sheet_metal_canada.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/writing_conclusion_sentences_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8545/files/10586026170.pdf
    • https://cdn.shopify.com/s/files/1/0431/2655/4781/files/bangalore_to_shimla_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/rakezudarulakilanagusoge.pdf
    • https://cdn.shopify.com/s/files/1/0457/8505/5398/files/dice_tower_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/al_quran_dan_terjemahan_melayu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/ccnp_security_free_download.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_off00006cd6.bin
df1adf2de7e3c66e5524e844748d507361eed4496ab22cf9629d461c47e37949
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD6 4760 bytes
font_01_sfnt_off00007d10.bin
cd4ade6d5570cd44ca5b6943f2803936a466f126c8f8fc7780e61dff4c43945c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D10 11104 bytes
font_02_sfnt_off0000a146.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA146 4324 bytes