Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b2a74d76684b20…

MALICIOUS

PDF

48.9 KB Created: 2020-08-18 16:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b1d634edb4ab934cffdcdfdd705298c SHA-1: c7a1c38d341cd238b268dd0db808cf768f7b56be SHA-256: 82b2a74d76684b20195815c268a5361891a89f999d1222ae7f422bec91695bd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, also contains numerous links to external PDF files, suggesting a link farm or redirection attempt. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards a phishing or redirection attack.

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=air+pollution+pdf+ppt
    • http://dadilaf.forestcitycremation.com/uploads/1/3/1/8/131856890/48dd8028fb64.pdf
    • http://files.thechakrahousemn.com/uploads/1/3/0/7/130738512/5325160.pdf
    • http://files.mulbartonwords.org/uploads/1/3/0/7/130738771/5525033.pdf
    • http://files.printable-ebooks.com/uploads/1/3/0/7/130776592/retasu-rawolovomofa-wozofu-tanoj.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4944/1687/files/56959029541.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/kometevap.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/mudibefutapitola.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/ziridujawinusidobige.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/58161099932.pdf
    • https://cdn.shopify.com/s/files/1/0434/5397/2633/files/voxalipoke.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/65187164732.pdf
    • https://cdn.shopify.com/s/files/1/0431/9202/5249/files/15407122818.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/jack_lalanne_s_power_juicer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xidab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/airway_management_download.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a6c.bin
45a24ce742cd26c6c30da73c92092d980bca8c94fd82f77222a44bc2fb87c2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6C 1880 bytes
font_01_sfnt_off00008390.bin
712ab181a5301654270ba4e078e91943cb0a9a0deeb404d33115025255f557ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8390 4636 bytes
font_02_sfnt_off00009360.bin
7f74e0a3064c7b8338f1e8afc094de33e8c68abe3309ba817bd1ca92bfa78a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9360 10472 bytes

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