Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefbf48ec5bb30cc…

MALICIOUS

PDF

44.5 KB Created: 2020-08-18 23:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31d0d153a611e8ce661389b4acccbcf SHA-1: b79d0384349903f33f8fbd6a5ff60797ff489687 SHA-256: aefbf48ec5bb30ccf79bac5109d45007010a7ba8d06d3bc36806d509ea57185a
154 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=synergy+spanish+pdf', which is flagged as malicious. Additionally, the PDF hosts a link farm pointing to numerous other PDFs, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content through seemingly legitimate channels. 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=synergy+spanish+pdf
    • http://files.rtlrescue.org/uploads/1/3/2/6/132681317/2ae7cf7ffea.pdf
    • http://files.mcdonaldband.com/uploads/1/3/1/8/131871488/ronitip_gudasedaz_nolobejofob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/pathogenesis_of_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3763/files/savezav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/pepeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1458/files/gavolisepekigon.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/88794571154.pdf
    • https://cdn.shopify.com/s/files/1/0432/5136/8104/files/bingo_cards_free.pdf
    • https://cdn.shopify.com/s/files/1/0443/1101/9676/files/67951707015.pdf
    • https://cdn.shopify.com/s/files/1/0443/4470/5180/files/sqlite_browser_windows.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/92950617392.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/32149472391.pdf
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/84897433837.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_off00006f81.bin
446758fc43898d00ade4d36da54be873a449c86edd28bc1dfd1690ef68d701af
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F81 5476 bytes
font_01_sfnt_off00008219.bin
5d7376388145b8bbc8ac70904d9169be9a54d9a5a3253d7c1307487d8cf536ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8219 10488 bytes