Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d24cded12da433…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 08:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47df2f1404497dbb8f5552de9922d0de SHA-1: 4069768923c51735b50c2c238ff58289f0031ecb SHA-256: 11d24cded12da433414374bd62b4ba6030ce623d9cda85ac08ddbc48f565af4e
154 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc'. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to direct users to malicious sites, potentially for phishing or to host further malicious 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.cc/wb?keyword=pdf%20icon%20vector%20free%20download
    • http://files.deepdabarberonline.com/uploads/1/3/1/8/131872087/3428542.pdf
    • http://xitaxodap.chenguatmit.com/uploads/1/3/0/8/130813528/vejami.pdf
    • http://files.danielleharth.com/uploads/1/3/1/8/131871938/1073206.pdf
    • http://files.charlottehager.com/uploads/1/3/1/4/131453432/9cd2b68b7a2e6cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/gusipigabazirufalizev.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/jogun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7625/files/lincoln_ac_225.pdf
    • https://cdn.shopify.com/s/files/1/0430/4463/4773/files/87048236700.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/wutodijis.pdf
    • https://cdn.shopify.com/s/files/1/0436/5749/4693/files/28127954224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/job_reclassification_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/veweniz.pdf
    • https://cdn.shopify.com/s/files/1/0439/5555/2414/files/telugu_bible_nighantuvu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/dr_br_ambedkar_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/voluropekebozimamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/the_bedford_reader_13th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/kotiwobejetotitog.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/tixinaniwibesivu.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_off000067b0.bin
8625aa01dfc174d17e8f2e09da86d345f072748811d626ccfbe0739e20749e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B0 4992 bytes
font_01_sfnt_off000078c4.bin
a342ea50dc66ede70a3f6c0b12f5d56e7908d4065f47ec0cd36dd1193638a408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 9980 bytes

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