Malicious PDF — malware analysis report

Static analysis result for SHA-256 90830f598c51f158…

MALICIOUS

PDF

46.4 KB Created: 2020-07-19 22:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 372e98a26ce0fb8922e6e1d512f61b02 SHA-1: 55a8a13ca5ae33aaef4360b87229cc27c62e7def SHA-256: 90830f598c51f158cfd35e6ae81f8f30070ad701eee375a5423696689235c4c9
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and contains a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to lure users to malicious sites, potentially for phishing or to download further malware. No scripts were extracted from this sample.

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=lng%20process%20description%20pdf
    • http://files.createmoremusic.com/uploads/1/3/1/1/131163788/valigawumas-mivoju-jobasifanax.pdf
    • http://files.writing4content.com/uploads/1/3/1/0/131070402/278dc.pdf
    • http://files.lukeandco.com/uploads/1/3/2/6/132682883/f133cb51dc0aa3.pdf
    • http://files.orilingo.com/uploads/1/3/1/6/131636589/6078262.pdf
    • http://files.enviscid.com/uploads/1/3/1/4/131438420/4a7cee931937.pdf
    • http://files.unfiltered-anastasia.com/uploads/1/3/1/4/131453633/6563354.pdf
    • https://ronezas.files.word
    • https://wojikife.files.wordpress.com/2020/07/vagituzijisi.pdf
    • https://tifexom.files.wordpress.com/2020/07/vojafopoxofijara.pdf
    • https://ronezas.files.wordpress.com/2020/06/senimu.pdf
    • https://wedikul.files.wordpress.com/2020/07/turup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6661/files/5468601726.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/xebifomop.pdf
    • https://cdn.shopify.com/s/files/1/0431/7455/9893/files/zamidunofiguvad.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/2790952215.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/mununuzowolagebap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/temaviputuzigadif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/24202715173.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/segisojotinad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulexukiwogefera.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_off0000785f.bin
ccd9c6b300839a4f0f9076ec678dcbbb78ef1a4a59f9613b46bcb540dd4db1f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785F 4808 bytes
font_01_sfnt_off000088be.bin
04b65bac658300317f4a31cde58d51ad126320c86e472007edbac58422f987c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 10480 bytes

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