Malicious PDF — malware analysis report

Static analysis result for SHA-256 1023a71f36b0db22…

MALICIOUS

PDF

43.1 KB Created: 2020-07-09 01:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d77bee4d17604e1c993a75dfa897b55 SHA-1: 57813fcdbba69b8292bfb7d1bc522cbdfdf58281 SHA-256: 1023a71f36b0db22cd93119805d000aa6bb70ff3acc591651a77b10e5320f4e5
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, https://ttraff.ru/wb?keyword=projectile%20motion%20formula%20derivation%20pdf, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a tactic to drive traffic to potentially harmful or spammy content.

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.ru/wb?keyword=projectile%20motion%20formula%20derivation%20pdf
    • http://files.thinkanomalous.com/uploads/1/3/2/7/132710787/nejugo_fetaxen_vijixer_nujogutoninuj.pdf
    • http://files.book-tailor.com/uploads/1/3/1/6/131606550/zivuzobo-buzore.pdf
    • http://files.ourstodiscover.ca/uploads/1/3/1/0/131069812/9111347.pdf
    • http://files.softwareoracles.com/uploads/1/3/1/4/131437733/633036.pdf
    • http://files.soapbarlounge.com/uploads/1/3/0/7/130776718/luriza_bokitewakikizu_sepipe.pdf
    • http://files.tsapconference.com/uploads/1/3/0/7/130738933/8706118.pdf
    • http://files.peterblackphotos.com/uploads/1/3/0/9/130969154/midilixebofu-rizoramedel-rokamuzufijudun.pdf
    • http://files.fittingroomligonier.com/uploads/1/3/0/8/130814672/sodumavasoso_sugenufefigu_tinivotosuna_sezomojodupebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jadulotixen.files.wordpress.com/2020/06/xiwatasiduvojo.pdf
    • https://godenodivo.files.wordpress.com/2020/06/xanitavezoluzapo.pdf
    • https://mugitaje350288304.files.wordpress.com/2020/07/7528549772.pdf
    • https://fenazudedo.files.wordpress.com/2020/06/22161444098.pdf
    • https://jesaseg.files.wordpress.com/2020/06/gejebitosuxuxavedojit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mujunevuduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006920.bin
19ba9f5bb510994d3b0d5b2b337914515b5fda8af1db7402c74beced84225db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6920 5140 bytes
font_01_sfnt_off00007a84.bin
56d84eda12316cd0d2cb8f7138b77f2f9b953e372ecf66304657993e8ec2f52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A84 10684 bytes

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