Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb674188eff4a54…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 03:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7f73e5e813a9baff339d42740f30c8c SHA-1: 5ba2cc4586b8b280e2a8fd864c9cad0d24039f20 SHA-256: bcb674188eff4a541adfdd6d32acc9583443ad24f0e856f7f1cc3ab165db3703
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external links, many hosted on Shopify, suggesting a link farm or content-loading mechanism. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the ttraff.com URL, which is likely the initial landing page for a phishing or malware distribution attempt.

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/wix?keyword=myscriptfont+template+pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/bemozuliwadifolus.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/accountant_resignation_letter_format_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0450/4390/8758/files/bootstrap_login_signup_form_codepen.pdf
    • https://static.usrfiles.com/ugd/136d07_aa77a45b9bd9491bb603f9837be2eb76.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/dragon_age_origins_feastday_gift_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2653/8911/files/learn_cryptocurrency_trading.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/bibliotecas_digitales_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7333/8533/files/indefinite_integrals_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/33109227614.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_off00005c3d.bin
f2f0ce9324c1008524657c33f576b03e2a860135381e0acd178ffa4d0c536de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3D 5408 bytes
font_01_sfnt_off00006e8b.bin
92693d5bae16692f0d101575f88fc7dbfb444902ec1ee054efca0d2bbb427f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8B 10092 bytes

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