Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d007f402b61d96…

MALICIOUS

PDF

60.6 KB Created: 2020-08-10 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389d4f45f65f1b4707d123c08ed5ab1c SHA-1: 2c8fa4f749023ef9ce460e9417a9b20804f395b0 SHA-256: 17d007f402b61d96559a8ce2d79aa24e8734fb15fbf567ae7098e727914a936d
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, 'https://ttraff.cc/pify?keyword=biografia+de+alexander+fleming+pdf', is flagged as a redirector, suggesting it's used to funnel users to malicious sites. The document body, though heavily obfuscated, contains references to this URL, reinforcing the malicious intent. The presence of a large number of external PDF links further supports the link farm classification.

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=biografia+de+alexander+fleming+pdf
    • http://jizezusa.singingeaglelodge.org/uploads/1/3/1/4/131453046/692199.pdf
    • http://kowuse.basketcasestheatre.org/uploads/1/3/0/8/130874359/6903653.pdf
    • http://files.emmapickettbreastfeedingsupport.com/uploads/1/3/0/8/130813401/wubowovopuvapuj.pdf
    • http://files.donnafiggdesign.com/uploads/1/3/1/1/131163902/06ad8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/63805517107.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/arraylist_em_java.pdf
    • https://cdn.shopify.com/s/files/1/0429/1333/3411/files/nadikudir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/dixep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/breakthrough_prayer_jim_cymbala.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/rerezuwotorudozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xamunodobesezuwenetubaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/xunenub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0937/5383/files/bijasizegokinegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/fupofexoxabevapuditaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/rotujiwemoberuzikamamuze.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/12186749602.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/33249895462.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_off0000af7f.bin
7bfd4dbeafa63ccc95097f06059df181f2fecc584585b8879cd7dbb9027891ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 5300 bytes
font_01_sfnt_off0000c173.bin
0fba27acd8ee6a30e4fcfb9a312f41a2516f39d407baa0af231f78e5aaa103c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 10484 bytes

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