Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e7256a26f504d8…

MALICIOUS

PDF

45.9 KB Created: 2020-09-09 18:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01acd5148742a12098882ff03a0c645c SHA-1: 8544ca8cb731a198c1b3d2d73de187ac46c168ca SHA-256: b4e7256a26f504d8f93772b58d4e5f05bbc11c1fd419d3e3066eb0c354d9eba3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for a 'free download' and embeds numerous links to external PDFs, many of which point to SEO-optimized link farms. One critical heuristic indicates a direct link to a known malicious redirector at ttraff.com. The document body itself is heavily obfuscated but contains the initial lure URL. No scripts were extracted from this sample.

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.
  • 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
  • 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/wb?keyword=arihant%20general%20knowledge%20book%20pdf%20free%20download
    • http://nulig.krgabogados.com/uploads/1/3/1/6/131637308/ruwibiw.pdf
    • http://files.interactive-maths.com/uploads/1/3/1/3/131397964/nojanulujowumujesi.pdf
    • http://files.metalworxroofing.com/uploads/1/3/0/7/130739239/3234161.pdf
    • http://files.livinglifewithcancer.com/uploads/1/3/0/8/130874655/6469520.pdf
    • http://tekusa.ndnarts.com/uploads/1/3/2/7/132740480/6745591.pdf
    • http://files.nflpicks16.com/uploads/1/3/0/7/130739431/jabufufe.pdf
    • http://wovasano.aphotobydre.com/uploads/1/3/2/6/132683014/nobevidi.pdf
    • http://fezezogim.cambridgesupervisiontraining.org/uploads/1/3/2/6/132681337/divef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/20032167130.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/salamanders_codex_supplement_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/postpartum_hemorrhage_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0437/8030/9141/files/basketball_score_sheet_excel_fiba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000623b.bin
ce72a0ddf1303d76ae8602da14f1dbe00b0457102805b53033858a650f056bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 5408 bytes
font_01_sfnt_off000074ad.bin
02e522f6f9354600fe2a71006ec08a3aeb443c9a226fc51e13b3e634456952c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AD 10352 bytes
font_02_sfnt_off00009843.bin
3cc1942d6ccc8a101982395fae3746f9be036b0744e80fbcc47eb0790b1f863f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9843 5016 bytes

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