Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba3249787d7f4fc…

MALICIOUS

PDF

50.4 KB Created: 2020-08-01 05:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d9e22d76c41b706260e3781161c0481 SHA-1: e92b9ca19aba91bb8aff9ae0c252c0b2a03f99d9 SHA-256: 4ba3249787d7f4fc95ee9a2b9d9729d9cad1b0e24fef2a37ea1058bb57117d74
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains the text 'Bloodborne undead giant' and the malicious URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=bloodborne+undead+giant
    • http://files.northwalestreeservices.com/uploads/1/3/0/9/130969312/6481884.pdf
    • http://files.laurakretz.com/uploads/1/3/1/8/131857364/c1f6b85ad.pdf
    • http://files.roxstardance.com/uploads/1/3/1/4/131412426/a78532c782085.pdf
    • http://files.newtonchineseschool-1.org/uploads/1/3/1/4/131437689/4217347.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/18246013765.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/nepotero.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0510/files/xebewegudem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/47161758067.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/71356301441.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/wiliragaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/59131620602.pdf
    • https://cdn.shopify.com/s/files/1/0434/0505/0021/files/32985901340.pdf
    • https://cdn.shopify.com/s/files/1/0437/9885/5837/files/29610043675.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8302/files/bagiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/tuxojotepebawipupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/tufilamug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006add.bin
31a9d7946fb804da4cedae213bf010346a14d45cef2033f83c8926ab103da620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADD 3412 bytes
font_01_sfnt_off0000771e.bin
e34d697b0f05e88a1fd950f0fc7c01fc1129304967c1f8e1accac33695b2414c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 4884 bytes
font_02_sfnt_off000087c1.bin
b3b360edb167fe7dc4cf231b843673d7ebf78955e63d1b3155a61cebf10fd0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87C1 11928 bytes
font_03_sfnt_off0000ae4b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4B 4324 bytes

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