Malicious PDF — malware analysis report

Static analysis result for SHA-256 abee4e4444afbafb…

MALICIOUS

PDF

52.3 KB Created: 2020-08-19 21:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc3ebd3c6da41c69a9b1490adbcd671e SHA-1: acbb5190334e470a68bb91247deb8451b1ae653d SHA-256: abee4e4444afbafb166828c747d5d1ebdca80f313e89cd08358c42f3e8a67de5
152 Risk Score

Malware Insights

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

The PDF contains a link farm, with many links pointing to Shopify-hosted PDFs, likely for SEO manipulation. One of these links, https://ttraff.com/pify?keyword=manualidades+navide%25C3%25B1as+con+papel+de+seda, is identified as a malicious redirector. The document body, though partially garbled, contains text related to crafts and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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=manualidades+navide%25C3%25B1as+con+papel+de+seda
    • http://files.arnprioranimalhospital.ca/uploads/1/3/1/4/131453401/225047.pdf
    • http://files.mancostrails.org/uploads/1/3/0/8/130813546/lidajunerudev_setanas_tuwikatiregapol.pdf
    • http://files.palmettopreswm.com/uploads/1/3/1/3/131379951/bd3da.pdf
    • http://files.riverraisinconference.net/uploads/1/3/2/8/132814935/koxiwodefekoz_jekodufaw_kitadememerafe_vitalef.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/sound_pollution_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/59128563304.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xagene.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/77489378701.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/dedajatuzuzogimulevutip.pdf
    • https://cdn.shopify.com/s/files/1/0431/5119/6315/files/employment_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/74173796746.pdf
    • https://cdn.shopify.com/s/files/1/0450/2405/1358/files/whois_godaddy_com.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/31883476322.pdf
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/75394496720.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulifagavukaxubodipiripu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.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_off00008b59.bin
53e3535b29bfc419eeaefc05b3b0c45c3e5bb0eedbf1a745db2f76ebb6a1b2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B59 5248 bytes
font_01_sfnt_off00009d0c.bin
0ced124cbc6b947a35c493c6d052dc9502f6fabb2680018f4387f9381b8c3acf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0C 11260 bytes

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