Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b79d8f9797306c4…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 22:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 239dfda0dc4374724a844b899c667acc SHA-1: 7c20953b145ddd6bb05244fd0c4a841df92d989c SHA-256: 4b79d8f9797306c44d05a0b67d6981b94b05f0ab054e5dfc461faef8718c0616
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=alimentos+organicos+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for the malicious content.

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=alimentos+organicos+pdf
    • http://files.sebaacademyschool.com/uploads/1/3/0/7/130775588/08f0e1c0d3ce470.pdf
    • http://files.cokosscrubs.com/uploads/1/3/0/7/130738641/678690.pdf
    • http://files.thesurflodgesanctuary.shop/uploads/1/3/0/7/130739742/3502388.pdf
    • http://files.adamsandevesusa.com/uploads/1/3/1/1/131163780/xebidomapabu.pdf
    • http://files.washingtonmidwives.org/uploads/1/3/1/6/131606289/wolixojeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/ridixerotarapoleb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8968/1822/files/dasemesaduwubix.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/41710814539.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/travie_mccoy_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/mosetutufirejobasov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/zojud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1068/files/mixozerokenotomuroji.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/1530947444.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/zunolozisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/68111387434.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/mitul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/1435935435.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_off00006c2f.bin
7113d536db2718e83e350697090de6b9509516907985b805443cfd14f3a636f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2F 5464 bytes
font_01_sfnt_off00007eae.bin
9fc8d5454a696216b274d561198b19051be450743b76bdf12f594e17b9ee2b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EAE 11580 bytes

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