Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebae1eb10dbabcb…

MALICIOUS

PDF

40.0 KB Created: 2020-07-30 18:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45bd6eaaa316d8d77fb77e79eeef8940 SHA-1: 3bfe2d9a5fda2e9b1b805ca6d52dc40433dd8f05 SHA-256: 6ebae1eb10dbabcb4426e2c21d095530a1e8f6cc4c82731d9c5ae66235584d83
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'additional mathematics book pdf download', suggesting a lure to entice users to click on the malicious links.

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/pify?keyword=additional+mathematics+book+pdf+download
    • http://files.anydogildorescue.org/uploads/1/3/1/3/131384300/lesodemodexag_woforad.pdf
    • http://files.stephaniecreaghan.com/uploads/1/3/1/4/131406893/19e84469.pdf
    • http://files.yogadansebienetre.com/uploads/1/3/1/6/131606533/sepimoliduzubup.pdf
    • http://files.flexgridtech.com/uploads/1/3/1/4/131405958/guwitidija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/foditivamuwapoxipefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/41243997010.pdf
    • https://cdn.shopify.com/s/files/1/0430/3696/7063/files/21956085907.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/52002486503.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/bunopolananunibexoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/pumipexaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1895/1576/files/lezufapaberimobibisu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/7891566015.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_off00005de0.bin
adcadba3f2edc4017afd37944302dcf8ba227d953a098745adc341df2f33fd46
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE0 5372 bytes
font_01_sfnt_off00007000.bin
11cedd17ed31c5b43817db82322c07ccdd7b1f7ec35c5b86c142f1cae5a02c3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7000 10484 bytes