Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a1b0fd5311d49…

MALICIOUS

PDF

33.9 KB Created: 2020-08-20 02:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 929e00fb912e587785003c743d287b95 SHA-1: e02b7403c1fc52710bec0a9b6c5f95e07a9dbc97 SHA-256: 813a1b0fd5311d49744c44b69ec74d22a1ec32f5f0d60c1f279074be10e637a9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, masquerading as a link farm for coloring sheets, with the primary malicious URL being a redirector. The document body and embedded URLs suggest a social engineering lure to direct users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL reinforces this assessment.

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=iguana+coloring+sheets
    • http://files.spanishcampwithprofe.com/uploads/1/3/2/8/132815181/e4fcb67.pdf
    • http://files.armstrongfami.com/uploads/1/3/2/8/132814286/1867318.pdf
    • http://tubopupeb.230congress.com/uploads/1/3/2/7/132740892/lorepasujejexivuku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1793/5770/files/86157582177.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/53595139828.pdf
    • https://cdn.shopify.com/s/files/1/0433/6972/6110/files/49973290225.pdf
    • https://cdn.shopify.com/s/files/1/0440/2076/0741/files/jquery_get_innerhtml.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/where_are_you_form_in_japanese.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/56523117687.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/digidumogekuseg.pdf
    • https://cdn.shopify.com/s/files/1/0438/2448/0416/files/gamubajazani.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/lexogiduxobedez.pdf
    • https://cdn.shopify.com/s/files/1/0435/7029/9038/files/leluwumevore.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/31899627448.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/60970591327.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/conduction_convection_radiation.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_off000049b4.bin
dbdb7e2b5b5ca6b8534ddbe2441eb17cada6f00443e33f9bd626789e5e4ff302
pdf-font-stream PDF embedded font (sfnt) at offset 0x49B4 4996 bytes
font_01_sfnt_off00005aa6.bin
e0f0de677400503b61b47a567f2691a8f8dd715690925963e7893bd086d77071
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA6 9500 bytes