Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ef3cb05c07170d…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cc35d4f0d152b8d103e30556a5d25be SHA-1: 46e8480afcadd30d05eedae65d543676d7593777 SHA-256: 09ef3cb05c07170dd1d4add385e4ff746675658f57d74a969a57e0508cb69a44
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, suggesting a phishing or scam attempt. The document body text, though garbled, contains references to 'Arduino course pdf' and embedded URLs, indicating an attempt to lure users to malicious or link-farmed content. The ML classifier also strongly flagged this PDF as malicious.

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=arduino+course+pdf
    • http://files.brecksvillecogop.org/uploads/1/3/0/7/130775490/sugumizoj_nojetemogitix_jodewato_dozumafedob.pdf
    • http://files.brandonautenmusic.com/uploads/1/3/2/6/132681033/2595696.pdf
    • http://files.theprofrocks.com/uploads/1/3/1/8/131857562/dapigevojinevi.pdf
    • http://kuzedala.soudersthirdgrade.com/uploads/1/3/0/8/130814017/5fdfce.pdf
    • http://wines.bigdaddywomack.com/uploads/1/3/0/9/130969742/xinedilenesikix_wosamuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/jufopubup.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/romupatabigakomikugavek.pdf
    • https://cdn.shopify.com/s/files/1/0432/3927/6707/files/samba_smb_conf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/96526442388.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/gumuxujiwexavesawatop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2038/files/fexigomadatigaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/88812815048.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4274895189.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/vexigijozilo.pdf
    • https://cdn.shopify.com/s/files/1/0445/6431/6319/files/beatriz_colomina.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/rebijemevufelaguvomeneted.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/letunulaviromu.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_off00006b5c.bin
d5a4ec9215766ab4d0714116bdd657f5459a39c2f757c53164a023171132c4ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 4896 bytes
font_01_sfnt_off00007c1d.bin
ab01eae9cb59b99d88dd29078e70909dae8588cef52975eb572d05dcba9116ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 11364 bytes

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