Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d8752dfda30448…

MALICIOUS

PDF

38.8 KB Created: 2020-08-17 02:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 633b3e0478c2065d757b79d65cf366f0 SHA-1: 94451feb467fe1df48a15d6d6564ff3966ab9487 SHA-256: 08d8752dfda3044837c6c46e59449250dc0ad0ca6bc0fc3f3ac06a5e1c8f5617
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The ML classifier also strongly indicated maliciousness. The primary function appears to be to lure users to malicious infrastructure through a link farm.

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=old+sinhala+audio+song+free
    • http://mejad.healingstreammedia.com/uploads/1/3/1/3/131398008/5860967.pdf
    • http://files.westseattlemonsterdash.com/uploads/1/3/0/7/130739112/dufewifi.pdf
    • http://files.genemediacreativestudio.com/uploads/1/3/1/6/131606408/e7bea637.pdf
    • http://files.intoschool.org/uploads/1/3/1/4/131483143/tumidovabar.pdf
    • http://files.campstar.org/uploads/1/3/1/4/131437378/ea115c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/gesefogowipimubafowov.pdf
    • https://cdn.shopify.com/s/files/1/0434/1006/3527/files/writing_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2565/3160/files/al_sweigart_automate_the_boring_stuff_with_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/gigaxorizukabadepufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/jowipenesur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/formation_aviculture_tropicale.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5796/files/last_resort_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/86706958549.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/losepojuzajawav.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_off000059f9.bin
3c500251e7b6e814d7b115fcfbb3d693ae60edcef6cc88c44176a3508ea49612
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F9 5196 bytes
font_01_sfnt_off00006b9b.bin
ad2b39825b09eafa758367308fa8bdc4c3c6739ad7632bac6102b45a55665976
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9B 10340 bytes