Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9d4f76766ba614…

MALICIOUS

PDF

41.2 KB Created: 2020-08-11 23:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef764054984529db94cb22fe895345b0 SHA-1: fca9184c433eef4eab4fccd15d6708e9d89bfa96 SHA-256: 7a9d4f76766ba6143ac8010249fcdb62b774641852b2cf190c72dae23219e20e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with this link-farming and redirection behavior.

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.cc/pify?keyword=mla+bibliography+sample+pdf
    • http://tegupemiw.takahirokudo.com/uploads/1/3/1/8/131871699/2436828.pdf
    • http://zerijix.smithnjones.co.uk/uploads/1/3/0/8/130814297/fuxomakepitom.pdf
    • http://perevim.cabincreekfarmstudio.com/uploads/1/3/0/8/130873995/8568750.pdf
    • http://files.r-cause.net/uploads/1/3/1/4/131453397/ledeveraxefugu_nobosobesarena_sutadelez_rovomatoxotar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2910/1735/files/chaos_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1311/9905/files/37877727429.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/avax_home_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/pdf_to_word_online_gratis_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3921/files/bukhari_shareef_urdu_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/gifagemopanad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/91881884099.pdf
    • https://cdn.shopify.com/s/files/1/0437/1985/2200/files/paradigma_penelitian_kualitatif_dan_kuantitatif.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/74401145152.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/86579512317.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/52645244781.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/wazogexipagutokujiwawaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/biraragefamesijakalonoj.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006211.bin
4c644a1910292ade671b4b8036ae92ca2e9aa026401fa300540cd761a912d7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6211 5704 bytes
font_01_sfnt_off0000755a.bin
58d5f09f0dd6b17014ebc7d71ae5ad8526d68e0e13b657cb85863706f5c84d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755A 10156 bytes

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