Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc649439c716fe4…

MALICIOUS

PDF

47.2 KB Created: 2020-07-27 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d11f6fbb4e80f3f6704840840d9b09d7 SHA-1: cc62af6ba08b314321b07667406643cec360fa39 SHA-256: 4fc649439c716fe4d34b112291a741693ed6cf3e7fa44fffca39879408defbf2
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=cm+browser+lite+apkpure', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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=cm+browser+lite+apkpure
    • http://files.tradeforward.com.au/uploads/1/3/1/4/131437322/4648567.pdf
    • http://files.eckiddiecollege.com/uploads/1/3/2/8/132815015/4ee0d33a05458f.pdf
    • http://files.caseworkproductions.com/uploads/1/3/1/3/131378899/silaru-letoje-dogabogug-tideguwuziro.pdf
    • http://files.shortmetina.com/uploads/1/3/1/0/131069992/xatupoxakot_pekuxikitagir_xiwofosava.pdf
    • http://files.sbrmga.com/uploads/1/3/2/7/132740172/6796018.pdf
    • http://files.shortmetina.com/uploads/1/3/1/0/131069992/xa
    • https://cdn.shopify.com/s/files/1/0428/8688/9639/files/dufamidefutiketixizoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kufotiniponekurek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/bilunufif.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/49508798148.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/79770893201.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/15063388267.pdf
    • https://cdn.shopify.com/s/files/1/0429/3050/3843/files/watedon.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/66792392370.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/satupijivux.pdf
    • https://cdn.shopify.com/s/files/1/0440/6312/9765/files/sagomudibosapizibufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/46380030301.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/29826270540.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/xivefusij.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_off000060f1.bin
5d1acadbf35f2fd4d50c49582a13ab4024770143d38e3bf58a10405ea9e60740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F1 5060 bytes
font_01_sfnt_off00007237.bin
f4b923f20665953239f7ca51f4647be7a400b9463b81f9915629603d82e84a11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7237 12616 bytes
font_02_sfnt_off00009a7f.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7F 16092 bytes

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