Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7904556e3d13a9…

MALICIOUS

PDF

42.7 KB Created: 2020-08-14 03:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bdf90f340a1f1adcd993c534842d61 SHA-1: b04f8956cf6ff5c5d66b06ee5de4144a238b3a3c SHA-256: 4f7904556e3d13a9945735a913cdc08769cf377573b0f9472c3621f99e311c13
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, characteristic of a link farm. One of these links, 'https://ttraff.cc/pify?keyword=crochet+baby+cap+video', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, potentially for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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=crochet+baby+cap+video
    • http://lebobot.cochranebmx.com/uploads/1/3/1/4/131453329/08247d73045d.pdf
    • http://kajuza.oceanescapestravel.com/uploads/1/3/1/4/131437657/7761342.pdf
    • http://files.gypsydenboutique.com/uploads/1/3/0/7/130739116/4023380.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/87507149260.pdf
    • https://cdn.shopify.com/s/files/1/0431/8602/8708/files/tintin_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/add_png_to_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/92064210034.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jomopebexifupuruxun.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/jujobivegubijelugamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/bexezadirab.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/4486217257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/guxetigalurobatepixulovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/libros_de_calidad_de_vida_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/pirelabuxixagul.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/luvawiwexokuwexat.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_off0000693b.bin
e46f891be05d9f103f5a8ba285e05f043ba93fc8740b61a38c92a6e2da6ad71f
pdf-font-stream PDF embedded font (sfnt) at offset 0x693B 5160 bytes
font_01_sfnt_off00007abf.bin
133153123903e3baec4b9fc23f3932e8809c9f718a91a7a8e291fbc7bb6b3fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABF 10356 bytes