Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50b5cc84c5718f…

MALICIOUS

PDF

38.6 KB Created: 2020-08-30 00:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72e42e682f99e6c2dc8a301a259f3c6d SHA-1: 9dbb50deb8641663155563d6fd3dc7315d20ad0c SHA-256: 0d50b5cc84c5718f94b112d11688a012a1c1b071bec397343d19f90717adda2f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/wix?keyword=cause+and+effect+nonfiction+passages+4th+grade, is flagged as a malicious redirector. The document also contains a large number of other PDF links, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful sites.

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.com/wix?keyword=cause+and+effect+nonfiction+passages+4th+grade
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/18295790330.pdf
    • https://cdn.shopify.com/s/files/1/0431/2783/2733/files/fubawuwagona.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/53379593014.pdf
    • https://cdn.shopify.com/s/files/1/0428/5720/1820/files/fidilemufifu.pdf
    • https://static.usrfiles.com/ugd/5ecadc_8e18a324fd1643f69b6e1310690a7fa9.pdf
    • https://static.usrfiles.com/ugd/253000_f4307b4609544a33a34d4ebc268e040a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c37399c1eb548f2be6e36137f614763.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/anorexia_nerviosa_en_nios_y_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/kikobowizonarufux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9482/files/allan_kardec_francais.pdf
    • https://cdn.shopify.com/s/files/1/0435/4021/8015/files/bizaturerazejabotug.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_off00004907.bin
03402f89ade47cdbba3040571093b467b867d2bf0491491b936a302983fb2cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4907 5376 bytes
font_01_sfnt_off00005b4d.bin
a9ab306db1f0de135f35025b3c298ee55669bc026981791e027d677fdc195e44
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4D 10032 bytes
font_02_sfnt_off00007da9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA9 4324 bytes