Malicious PDF — malware analysis report

Static analysis result for SHA-256 132c41e211362a76…

MALICIOUS

PDF

45.5 KB Created: 2020-08-22 03:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69ea20282e7ea734f443c95a5c4b21bb SHA-1: ca41027a934a346f186292da6c5bccdf161a9fda SHA-256: 132c41e211362a76e260aaaf9052f6e92f09508c25c7bb9eecf5e201abf62998
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a movie title, which redirects to a malicious URL. The document also hosts a large number of external PDF links, many of which are benign but likely serve to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the embedded URL heuristic confirms the presence of a link within the document body.

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=brown+sugar+2002+full+movie
    • http://files.educationmosaic.com/uploads/1/3/1/6/131636678/6979851.pdf
    • http://files.tilelayerhamilton.com/uploads/1/3/2/3/132302940/e4f1d5b9515945f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/barstool_warrior_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/vijala.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/goluwoligit.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/the_crooked_man_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/naxig.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/mastic_asphalt_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/tegaratubulutabokanigub.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/99527299471.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/74790317614.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/82978286594.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/68982066840.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/quran_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006466.bin
285ec1bed9db2909574e7e40c0f2dbc001b666e7b2bd8649f508a06153fa735d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 5364 bytes
font_01_sfnt_off0000769c.bin
50a2186e7795117569cda5bf1faff4dd27dfca3aa4e6dce0526f38cd497a84c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769C 10552 bytes
font_02_sfnt_off00009ae4.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE4 4324 bytes

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