Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b045f10187e90f…

MALICIOUS

PDF

43.2 KB Created: 2020-08-11 02:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae50eb6a966abea188f9581d510e0ba SHA-1: db6de4d2d389bf91805c1bc757d3039705594a70 SHA-256: a9b045f10187e90f959a4e4770689469a15fbd04e5965fa0d8a74021755a2b78
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=barbarian+at+the+gate+pdf'. This indicates a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=barbarian+at+the+gate+pdf
    • http://files.zanyunoodles.com/uploads/1/3/1/4/131453645/savirubo_mesepilejogaz.pdf
    • http://lebunovux.exmdi.com/uploads/1/3/0/7/130775519/1d3820bd4.pdf
    • http://files.ktabkhaneh.com/uploads/1/3/1/4/131437657/milosafepavam_voximoge_liwirakefigamaj_jijajisijid.pdf
    • http://files.vb-publishing.com/uploads/1/3/2/6/132695365/2630720.pdf
    • https://cdn.shopify.com/s/files/1/0430/1901/0201/files/88278128729.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/11365950408.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/jukomizazuxinixelosomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/29281619044.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/97850501613.pdf
    • https://cdn.shopify.com/s/files/1/0428/3816/3623/files/58077062264.pdf
    • https://cdn.shopify.com/s/files/1/0434/6036/2392/files/2519629768.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/asmaul_husna_dan_artinya_lengkap_99.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/degapibarolaze.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/68288049357.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/boruxunijutaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/16810394966.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/27123235127.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_off00006560.bin
d4fc5c037ce311d06461c852f29d2d8518e316d4ca7567dc30a4c4f176557358
pdf-font-stream PDF embedded font (sfnt) at offset 0x6560 5284 bytes
font_01_sfnt_off00007747.bin
422a9149b8ec64e36a3503be97399897626c040864be126b11b00e6185ff72f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7747 14004 bytes