Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdaec94a440df26…

MALICIOUS

PDF

40.7 KB Created: 2020-08-24 23:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eac5a66a0696df52e2adeceb605ce716 SHA-1: 99e247696c1b07d188aa08a88657e50ca11cbdaa SHA-256: ccdaec94a440df26e92975f6ef63e2503c799461cd484c2f61d201ab3603aaa4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to a 'makeup brush numbering guide'. The primary attack vector is likely a user clicking the malicious link within the PDF, leading to a redirector.

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=makeup+brush+numbering+guide
    • http://widajufi.depthstiny.com/uploads/1/3/0/8/130814579/jajuvabegojenoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/answer_back_phrase_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/jovebafovuguxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/elite_dangerous_how_to_change_hud_color.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/merriam_webster_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9052/files/glencoe_geometry_1-_2_skills_practice_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/59677681116.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6389/files/nikola_tesla_mes_inventions.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/59012158369.pdf
    • https://cdn.shopify.com/s/files/1/0434/5023/7085/files/gezodojetofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofelowuloluvazoriwonub.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/engineering_c_programming_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0469/files/xliff_editor_mac_is.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_off00005f2e.bin
68773b28b4b53e450877bafe39bb168125719bf1b69e0fd05ff863fd430dc8f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 5552 bytes
font_01_sfnt_off000071d9.bin
e6776b1a9024b55edea18a37de469341a2ec4bca179990d0d4f0ac2abfad853b
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 10676 bytes