Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3b8db864f25ebb…

MALICIOUS

PDF

48.2 KB Created: 2020-08-18 19:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64349c6004df448b0516d1254596794d SHA-1: 642833bea5a45d6a0d6b616c1fe8dbdea7690067 SHA-256: 5f3b8db864f25ebb99e5f71c98134d781d6536a394328d1bd9d4624d1368e0b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to further malicious content. The document also contains a large number of links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the presence of malicious links.

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=bulbul+tarang+banjo+app
    • http://nofix.staceyloper.com/uploads/1/3/0/8/130874676/2744216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdf
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/zafuxuwevipuxugorapema.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/tetofilixuzovulaxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4501/1112/files/the_exorcist_tv_show_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/sikovakagexejupopofol.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/vocabulary_words_with_meaning_in_urdu_and_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/audit_assurance_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/hillsborough_county_electronic_report_cards.pdf
    • https://cdn.shopify.com/s/files/1/0429/4282/4614/files/jixixiw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e6.bin
709d08cfb481a4bf6fb11abb3b4e9ca7e296bed30ef17df36dfed286c0ea07e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 5072 bytes
font_01_sfnt_off00007538.bin
2c35a43f960d60e39e1aebfe4319708614d665434eb674961c20ba3d6e1dc1e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7538 3192 bytes
font_02_sfnt_off00008265.bin
d34e9645e844948bcf7a22718215cffb6248398097f98e5dca790d2685cc734e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 10876 bytes
font_03_sfnt_off0000a7c2.bin
b9d99dd2a7f6f0d7910fd448f6f8254e61a177cad6bb3a953a20fbbd486ad409
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C2 2976 bytes