Malicious PDF — malware analysis report

Static analysis result for SHA-256 45650b311b953a44…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 04:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ec7cf7fec4826f7eacc9381e3c027f9 SHA-1: 65e72b76b1f4c35129337b2b7ee11390a31869d8 SHA-256: 45650b311b953a4449104d7cc326279bba473c7da47a9d1780c44013e1dd3111
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting PDF files, which is indicative of a link farm. One of these links, https://ttraff.com/wix?keyword=test+moca+alzheimer, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious redirector URL.

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=test+moca+alzheimer
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/spivak_category_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65939759823.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/effects_of_migration_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0449/3633/1419/files/aluminum_hydroxide_gel_davis.pdf
    • https://cdn.shopify.com/s/files/1/0429/4151/3895/files/resignation_letter_sample_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/asphyxie_perinatale_du_nouveau_ne.pdf
    • https://cdn.shopify.com/s/files/1/0437/1369/1799/files/black_hole_temperature.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/buwemerudoruwutoxib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/my_house_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/the_sheikh_s_ransomed_bride_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/icao_annex_10_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/84072786173.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/lemareforemunekonokogonav.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070fc.bin
cdcac3ee23c4352a4b3309f4d1a1f1573f412013070a7ecf92ea30dca49e73e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FC 5040 bytes
font_01_sfnt_off000081fc.bin
c2303f90c05cff6d60c05be542c54ada182d4a1808c7bb639159336fda016d95
pdf-font-stream PDF embedded font (sfnt) at offset 0x81FC 10780 bytes