Malicious PDF — malware analysis report

Static analysis result for SHA-256 4654da5b413dd6ec…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 13:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 212681e2a685d83fb9e1e818f100c02b SHA-1: 24acc0c0b8dd789f73c1710307c1f10ae38f689e SHA-256: 4654da5b413dd6ec1eced5c3283ac2cd040c329898536387796e589a78e32702
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=anthropology+telugu+books+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify URLs, suggesting a link farm or content-luring tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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=anthropology+telugu+books+pdf
    • http://files.evansvillechildrenschoir.com/uploads/1/3/0/8/130813511/jololuduref-kuzovikogi-juzafalarugu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3389/2763/files/51315067725.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5351/files/tipedopuwaxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/bootstrap_slideshow_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7169/files/arthur_schopenhauer_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77160317291.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/sovuxatado.pdf
    • https://cdn.shopify.com/s/files/1/0441/1890/0888/files/the_navigator_bible_studies_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/25663242275.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/sukiwurunawalafinev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/72484559680.pdf
    • https://cdn.shopify.com/s/files/1/0436/9108/1882/files/banner_maker_pro_free_full_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ff0.bin
d749bbf950dae42a4204c8a8efbfa18fb1d2cf599f88ea6db14341f7d2849b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF0 5388 bytes
font_01_sfnt_off00006240.bin
4fba93edc8f00530f0c20a78015779bf0b478b0604a08dd7df754c8dc7f64902
pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 9932 bytes
font_02_sfnt_off0000847b.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x847B 16164 bytes