Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc68cf2d821c2b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-02 15:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b43577c365567afb0a25c314c78876 SHA-1: 283c3ff2fb990ad9484da4d99d44ed9eb2b34883 SHA-256: a3fc68cf2d821c2b6b7f1cf004e8818b42fb896221877b5b5d03c6822895b123
152 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to a link farm hosted on cdn.shopify.com, which is a common tactic for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wb?keyword=add%20worksheet%20to%20current%20workbook%20vba'. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

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/wb?keyword=add%20worksheet%20to%20current%20workbook%20vba
    • http://files.jeangoto.com/uploads/1/3/1/6/131606343/lasidilama_xonogukekuxoli.pdf
    • http://files.highlandheightscoc.net/uploads/1/3/0/9/130969370/f834f462a582.pdf
    • http://files.cypressuniforms.com/uploads/1/3/1/4/131455680/serigotujuzetap-lulusubatex-dozuliwunopaxu.pdf
    • http://files.jewelsofafrica.org/uploads/1/3/0/7/130775786/talabojinatilo_timexilogurago_sezoweduwuzo_jegiwusemuvu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/zexuli.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9561/files/gta_online_best_apartment.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/mixikaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/44168681587.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/35221264404.pdf
    • https://cdn.shopify.com/s/files/1/0428/4317/7126/files/zebawovu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/naruto_shippuden_movie_2_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8722/files/65920597387.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/85414560273.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/60727522964.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/lupeve.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/muwikuwusoga.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/55680476255.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/giforad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/25253043641.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_off00006b3b.bin
d0ecc4fae2c55142692baf5250b61e5f9573a6ef7ca74bca8904bce3485dc604		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3B 5340 bytes
font_01_sfnt_off00007d7b.bin
5cc1f729a1ee7022e21551230e939412676bd28bec817e34fc5ce0417d00b664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7B 10304 bytes

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