Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b0a47aacf275ae…

MALICIOUS

PDF

40.8 KB Created: 2020-08-07 23:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33d5824aa126c44d2b78360af17e333 SHA-1: 61dac5480f37f6136875f061fd3cc5a858642338 SHA-256: 70b0a47aacf275ae11f02efad92a8e642374cacd6aa4787cc353fb07f822165f
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying it as a redirector link to malicious infrastructure. Another heuristic indicates a link farm, suggesting an attempt to distribute malicious content. The presence of a 'download button' lure further supports a phishing or redirection attack. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sepse+neonatal+sbp+pdf
    • http://files.friendshipministries.com/uploads/1/3/0/7/130738614/nilesapukufuj.pdf
    • http://files.carolinagreenindustrynetwork.com/uploads/1/3/1/6/131606487/1731aa872b4ad.pdf
    • http://files.irieiwaforstudentsinc.org/uploads/1/3/1/3/131397946/3297795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/sekiro_ashina_sake.pdf
    • https://cdn.shopify.com/s/files/1/0430/1871/5289/files/degib.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7094/files/13762928072.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/lewikekotibokuvelekos.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/12836025522.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5923/files/91895205513.pdf
    • https://cdn.shopify.com/s/files/1/0438/2919/8998/files/angela_merkel_biography.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/77370042063.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/completely_uninstall_mysql_mac.pdf
    • https://cdn.shopify.com/s/files/1/0440/3272/1046/files/important_biology_questions_for_ssc_cgl.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/66531530771.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/viwivurakevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/callan_method_book_4.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_off000061a5.bin
90791c37ce8910e5ccdb0d7701c7545dc56c859694e265ccfafe65451f27d765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 5180 bytes
font_01_sfnt_off00007350.bin
14279349663b2248b76d8d93ccce7bcc68ed95a63cd6c220416a6f24a6cb7be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10340 bytes

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