Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd2c3c7a41c1c5a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 18:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfebe93767827e3e6b99b14442444161 SHA-1: a28a0fdd67ae736061041459da392965db2ad5b6 SHA-256: 6bd2c3c7a41c1c5a27ef2ffea92248ec3f8ed43c32beb5f4c93fcceeb0b05a18
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDF files, forming a link farm, and a prominent malicious redirector link. The primary malicious link, 'https://ttraff.cc/pify?keyword=german+a1+vocabulary+list+pdf', is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to the redirector URL, reinforcing its malicious intent.

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=german+a1+vocabulary+list+pdf
    • http://files.hubcapburger.com/uploads/1/3/2/7/132740814/suguwidazefige-bekilusakaduwig-japufemif-wofavurumunufoz.pdf
    • http://files.stevenhendricks.net/uploads/1/3/1/8/131857193/d1c2d6b9d5.pdf
    • http://files.mattyoungactor.com/uploads/1/3/0/7/130739811/2018040.pdf
    • http://files.carolynburkestl.com/uploads/1/3/0/8/130814342/wewasuruxegate_lufuza_tozijizavesifu_sofogaxeb.pdf
    • http://files.dogwoodstudiosnc.com/uploads/1/3/0/7/130739318/5ec476c97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/rotalaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/60918941990.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/xoboxitux.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/wipig.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/wavepad_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/craigslist_fresno_free_stuff.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/63729945916.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/realtek_usb_2._0card_reader.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/munukabupiwokewimifewojo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4234/0007/files/42367215477.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/55839352768.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000574e.bin
b65c43decd264a2c382228dc819decd8ff7ef6313f3afdc047a7eb3ff176d876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574E 5684 bytes
font_01_sfnt_off00006a95.bin
71a6025baa1e2e4f60e1c3b4a07231b124d8771d76a98fa212f82183f063e1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A95 2768 bytes
font_02_sfnt_off0000764b.bin
11b39b273d135cc743873f38b454628b07edda07d43962134cfc8bd5a6836a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764B 10060 bytes

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