Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dbe168dece0588…

MALICIOUS

PDF

42.5 KB Created: 2020-08-18 22:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd380581ded45123bee456f5219f75d4 SHA-1: d36863a30c930a7dd00e5c61c32d54ae4317d149 SHA-256: 09dbe168dece0588d105342030c62255f001e0d65a5cdf5bf27f1c666fc24ff7
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary malicious redirector URL, disguised with a "Clash of Clans hack" lure. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to drive traffic to external, potentially malicious, sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=clash+of+clans+hack+pc+app
    • http://files.richardpwenzel.com/uploads/1/3/0/8/130814529/xuxax.pdf
    • http://files.greendoornorway.com/uploads/1/3/0/9/130969206/744bbbc17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7115/8949/files/61871997510.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/divorce_application_form_victoria.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/45820398387.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/vuminonufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/17420154920.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/85001524200.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/dd_form_1351_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/62959650616.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/dd_the_weeknd_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/2370/3970/files/finibotuwux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/evidence-_based_medicine_guidelines_for_migraine_headache.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/zopifowakepetifepaxasaj.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_off000068ac.bin
009ffa56c0984d7a845bdb7f2eeedaa877fa5edc8293cb4a160ad40a372561bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AC 4976 bytes
font_01_sfnt_off00007995.bin
3cc78609b828b9c728e61af0cbac14315d547cabb146e87b4f19702356ebfc22
pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 10436 bytes